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Worksheets

Chemistry Unit 1

Total questions: 194

Worksheet time: 2hrs 14mins

Name
Class
Date
1.

What sub-atomic particle is labelled A?

a)

Neutron

b)

Electron

c)

Ion

d)

Atom

2.

What sub-atomic particle is labelled B?

a)

Neutron

b)

Electron

c)

Ion

d)

Atom

3.

Which atom has 4 electrons?

a)

Atom A

b)

Atom B

c)

Atom C

d)

Atom D

4.

Which atom would be found in group 2?

a)

Atom A

b)

Atom B

c)

Atom C

d)

Atom D

5.

Carbon has 6 electrons. Which atom is carbon?

a)

Atom A

b)

Atom B

c)

Atom C

d)

Atom D

6.

What is the relative atomic mass of lithium?

a)

7

b)

3

c)

4

d)

10

7.

What is the atomic number of lithium?

a)

7

b)

3

c)

4

d)

10

8.

How many neutrons does a lithium atom have?

a)

7

b)

3

c)

4

d)

10

9.

What is the mass and charge of an electron?

a)

Mass = 1, Charge = Neutral

b)

Mass = 1, Charge = Positive

c)

Mass = 1, Charge = Negative

d)

Mass = almost 0, Charge = negative

10.

What is the mass and charge of an Proton?

a)

Mass = 1, Charge = Neutral

b)

Mass = 1, Charge = Positive

c)

Mass = 1, Charge = Negative

d)

Mass = almost 0, Charge = negative

11.

What is the mass and charge of an Neutron?

a)

Mass = 1, Charge = Neutral

b)

Mass = 1, Charge = Positive

c)

Mass = 1, Charge = Negative

d)

Mass = almost 0, Charge = negative

12.

What is an element?

a)

2 or more substance not chemically combined

b)

substance made of 1 type of atom

c)

substance made of more than one type of atom chemically joined together

d)

atoms of the same element with different number of neutrons

13.

What is an compound?

a)

2 or more substance not chemically combined

b)

substance made of 1 type of atom

c)

substance made of more than one type of atom chemically joined together

d)

atoms of the same element with different number of neutrons

14.

What is an mixture?

a)

2 or more substance not chemically combined

b)

substance made of 1 type of atom

c)

substance made of more than one type of atom chemically joined together

d)

atoms of the same element with different number of neutrons

15.

What is an isotope?

a)

2 or more substance not chemically combined

b)

substance made of 1 type of atom

c)

substance made of more than one type of atom chemically joined together

d)

atoms of the same element with different number of neutrons

16.

How many electrons can you put in the 1st, second and third electron shells?

a)

4,4,8

b)

2,8,8

c)

4,8,8

d)

1,2,8

17.

What is John Dalton's model of the atom?

a)

Electrons orbit in fixed energy levels (shells)

b)

Nucleus at the centre of the atom

c)

Protons and neutrons found in the nucleus

d)

A solid sphere that could not be divided into smaller parts

18.

What did Niels Bohr discover about the Atom?

a)

Electrons orbit in fixed energy levels (shells)

b)

Nucleus at the centre of the atom

c)

Protons and neutrons found in the nucleus

d)

A solid sphere that could not be divided into smaller parts

19.

How do you calculate the number of neutrons in an atom?

a)

atomic number + mass number

b)

Mass number - atomic number

c)

Atomic number - mass number

d)

Mass number x atomic number

20.
What is the chemical symbol for the element hydrogen
a)
H
b)
He
c)
h
d)
he
21.
What is the chemical symbol for the element Silicon
a)
S
b)
Si
c)
si
d)
Sl
22.
What is the chemical symbol for the element Carbon
a)
ca
b)
co2
c)
C
d)
Cd
23.
What is the chemical symbol for the element copper?
a)
co
b)
c
c)
Cu
d)
cu
24.
What is the chemical symbol for the element Aluminum
a)
A
b)
AL
c)
Al
d)
al
25.
What is the chemical symbol for the element Nitrogen
a)
Ni
b)
N
c)
No
d)
Nb
26.
What is the chemical symbol for the element oxygen
a)
O
b)
Oxy
c)
ox
d)
Oy
27.
What is the chemical symbol for the element Silver
a)
S
b)
Si
c)
Au
d)
Ag
28.
What is the chemical symbol for the element Chlorine
a)
C
b)
Cl
c)
cl
d)
Ch
29.
What is the chemical symbol for the element Gold
a)
G
b)
go
c)
AU
d)
Au
30.
What element is represented by the Chemical symbol Mg
a)
Manganese
b)
Magnesium
c)
Molybdenum
d)
Mitrium
31.
What is the chemical symbol for the element Iron
a)
I
b)
Ir
c)
Fe
d)
fe
32.
What is the chemical symbol for the element Zinc
a)
Z
b)
Zn
c)
Zr
d)
zn
33.
What is the chemical symbol for the element Helium
a)
He
b)
he
c)
H
d)
h
34.
What is the chemical symbol for the element Calcium
a)
C
b)
Ca
c)
Cl
d)
CL
35.
What is the chemical symbol for the element Potassium
a)
K
b)
P
c)
Po
d)
Pt
36.
What is the chemical symbol for the element Phosphorus
a)
p
b)
P
c)
Ph
d)
Ps
37.
What is the chemical symbol for the element Sodium
a)
Na
b)
So
c)
S
d)
Sd
38.
What is the chemical symbol for the element Iodine
a)
I
b)
Io
c)
Id
d)
In
39.
What is the chemical symbol for the element Fluorine
a)
F
b)
Fl
c)
Flu
d)
f
40.
The atomic number tells you what?
a)
number of electrons
b)
number of protons
c)
number of neutrons
d)
both electrons and protons in an atom.
41.
Which is the correct formula for:
one carbon (C)
two oxygen (O)
a)
CO2
b)
CO
c)
C2O
d)
2CO
42.
How many elements are in H2O?
a)
1
b)
2
c)
3
d)
4
43.
What is Fe2O3
(rust) made up of?
a)
1 flourine, 2 einsteinium,
3 oxygen
b)
2 fluorine, 3 oxygen
c)
2 iron, 3 oxygen
d)
2 iron, 3 osmium
44.
________ are the COLUMNS on the periodic table and are organized by similar properties.
a)
Classifications
b)
Groups
c)
Periods
d)
Elements
45.
Air is a compound.
a)
True
b)
False
46.
Compounds are made up of two or more atoms physically combined.
a)
True
b)
False
47.
How many elements are represented in the compound?
Na2CO3
a)
1
b)
2
c)
3
d)
4
48.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
49.
Which of the substances below is a compound?
a)
ink
b)
air
c)
oxygen
d)
salt
50.
Can compounds be found in the periodic table?
a)
Yes
b)
No
51.
How many carbon atom/s are present in the compounds CaCO3?
a)
1
b)
2
c)
3
d)
4
52.
Is water an element or a compound?
a)
Element
b)
Compound
53.
A compound consists of two or more elements bound together.
a)
True
b)
False
54.
Is Iron (Fe) an element or a compound?
a)
Element
b)
Compound
55.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
56.

Is the sugar glucose (C6H12O6) an element or a compound?

a)

Element

b)

Compound

57.

CaF2- name?

a)

calcium fluorate

b)

calcium fluoride

c)

fluoride calcite

d)

fluorine calciumate

58.
K20 - name?
a)
potassium dioxide
b)
potassium oxide
c)
potassium oxygen
d)
dipotassium dioxide
59.

HCl- name?

a)

hydrogen chloride

b)

chlorine hydrogen

c)

hydrogen chlorine

d)

hydrogen chlorate

60.

MgO- name?

a)

oxygen magnesium

b)

magnesium oxide

c)

magnesium oxate

d)

magnesium oxygenate

61.

KH- name?

a)

potassium hydrate

b)

potassium hydrogen

c)

potassium hydride

d)

hydrogen potassiate

62.

HI - name?

a)

iodine hydrogenide

b)

hydrogen iodine

c)

hydrogen iodide

d)

hydrogen iodate

63.

Which formula shows potassium iodide?

a)

KI

b)

Ki

c)

KIO3

d)

KIO2

64.
What is the correct name of the compound with the formula MgO?
a)
magnesium oxygen
b)
magnesium oxide
c)
manganese oxygen
d)
manganese oxide
65.
What is the correct name of the compound with the formula KH?
a)
potassium hydrogen
b)
potassium peroxide
c)
potassium hydride
d)
potassium monohydride
66.
What is the correct name of the compound with the formula CaO?
a)
calcium oxide
b)
calcium oxygen
c)
calcium monoxide
d)
monocalcium monoxide
67.
What is the correct name of the compound with the formula KCl?
a)
potassium chloride
b)
potassium chlorine
c)
potassium monochloride
d)
potassium monochlorine
68.
What is krypton?
a)
element
b)
compound
c)
mixture
69.

The positive particles of an atom are

a)

electrons

b)

positrons

c)

neutrons

d)

protons

70.

The central region of an atom where its neutrons and protons are is its

a)

nucleus

b)

electron cloud

c)

core

d)

center

71.

Particles in an atom that are neutral and have no charge are

a)

negatrons

b)

electrons

c)

neutrons

d)

protons

72.
A particle that moves around the nucleus is a(n)...
a)
Proton
b)
Neutron
c)
Electron
d)
Quark
73.

What does the 1.00794 stand for?

a)

Hydrogen

b)

atomic number

c)

atomic mass

d)

atomic explosion

74.

In the modern periodic table, elements are arranged by:

a)

atomic mass

b)

atomic number

c)

valence electrons

d)

number of isotopes

75.

The central region of an atom where its neutrons and protons are is its

a)

nucleus

b)

electron cloud

c)

core

d)

center

76.

An atom with atomic number 6 would have how many protons

a)

6

b)

12

c)

3

d)

cannot be determined

77.

What is the number of protons that the element in this image contain?

a)

14

b)

7

c)

15

d)

18

78.
What is the atomic mass of "F"
a)
9
b)
18
c)
17
d)
19
79.

How many neutrons are in the atom "K"?

a)

7

b)

2

c)

39

d)

20

80.
What are the 3 particles that make-up the atom?
a)
protons, neutrons, and isotopes
b)
neutrons, isotopes, and electrons
c)
positives, negatives, and electrons
d)
protons, neutrons, and electrons
81.
Beryllium has how many protons?
a)
4
b)
9.0122
c)
2
d)
13.0122
82.

What type of charge does an electron have?

a)

positive

b)

no charge/neutral

c)

negative

83.

How do you find the atomic number?

a)

by the number of electrons

b)

by the number of protons

c)

by the number of neutrons

84.

The number of neutrons in an atom =

a)

protons - neutrons

b)

mass number - protons

c)

protons + neutrons

d)

mass number + electrons

85.

What is the element symbol?

a)

Argon

b)

Ar

c)

18

d)

39.948

86.

What is the element name?

a)

Argon

b)

Neon

c)

18

d)

Ar

87.

The number 18 represents the

a)

Atomic number

b)

Neutrons

c)

Element Name

d)

Element symbol

88.

The mass number of an atom =

a)

protons + neutrons

b)

protons - neutrons

c)

electrons - neutrons

d)

neutrons + electrons

89.
In an atom, what is the number of protons equal to?
a)
the number of electrons
b)
the number of neutrons
c)
the number of molecules
d)
the number of nuclei
90.
True or False? Neutrons have a negative charge
a)
True
b)
False
91.
Most of the mass in an atom is concentrated in the...
a)
electrons
b)
nucleus
c)
protons
d)
empty space
92.
What subatomic particle is electrically neutral (no charge)?
a)
Proton
b)
Ion
c)
Neutron
d)
Electron
93.
What is the mass of an atom if it has 11 protons, 12 neutrons, and 11 electrons?
a)
22
b)
11
c)
34
d)
23
94.
If an atom has 10 protons, 10 neutrons, and 10 electrons, what is the mass of the atom?
a)
10
b)
20
c)
30
95.
What subatomic particle(s) would be found orbiting the nucleus?
a)
Neutrons only
b)
Electrons only
c)
Protons and Neutrons
d)
Protons and Electrons
96.
Protons and Electrons balance the charge of an atom.
a)
True
b)
False
97.
If an atom has 12 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom?
a)
12 neutrons
b)
12 electrons
c)
12 protons
d)
24 protons and neutrons
98.
What particle uniquely identifies an element?
a)
Number of Valence Electrons
b)
Number of Protons
c)
Number of Electrons
d)
Atomic Mass
99.
What subatomic particle is positively charged and is located inside of the nucleus?
a)
Proton
b)
Neutron
c)
Electron
d)
Ion
100.
What is the atomic number for an element with three protons?
a)
2
b)
1
c)
3
d)
6
101.
What is the electrical charge of a proton?
a)
1+
b)
1-
c)
neutral
d)
2-
102.
Electrons have virtually no mass (weight).
a)
True
b)
False
103.
Which is an electron?
a)
A
b)
B
c)
C
104.
Which is a proton?
a)
A
b)
B
c)
C
105.
Which is a neutron?
a)
A
b)
B
c)
C
106.
According to Ernest Rutherford, an atom is made of mostly....
a)
empty space
b)
electrons
c)
the nucleus
d)
protons
107.

This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. It shows electrons floating freely in a positive region.

a)

The "Plum Pudding Model" of the atom

b)

The "Rutherford Model" of the atom

c)

Democritus's model of the atom

d)

The "Quantum Mechanical Model" of the atom

108.
Ernest Rutherford discovered that atoms were mostly _________________. 
a)
negatively charged
b)
positively charged
c)
electrons
d)
empty space. 
109.

In the atomic model nicknamed the "plum pudding" model, what do the plums represent?

a)

the nucleus

b)

the atom

c)

the electrons

d)

the positive material

110.

What sub-atomic particle is labelled A?

a)

Neutron

b)

Electron

c)

Ion

d)

Atom

111.

What sub-atomic particle is labelled B?

a)

Neutron

b)

Electron

c)

Ion

d)

Atom

112.

What is the atomic number of lithium?

a)

7

b)

3

c)

4

d)

10

113.

What is the relative atomic mass of lithium?

a)

7

b)

3

c)

4

d)

10

114.

How many neutrons does a lithium atom have?

a)

7

b)

3

c)

4

d)

10

115.

What is the mass and charge of an electron?

a)

Mass = 1, Charge = Neutral

b)

Mass = 1, Charge = Positive

c)

Mass = 1, Charge = Negative

d)

Mass = almost 0, Charge = negative

116.

What is the mass and charge of an Proton?

a)

Mass = 1, Charge = Neutral

b)

Mass = 1, Charge = Positive

c)

Mass = 1, Charge = Negative

d)

Mass = almost 0, Charge = negative

117.

What is the mass and charge of an Neutron?

a)

Mass = 1, Charge = Neutral

b)

Mass = 1, Charge = Positive

c)

Mass = 1, Charge = Negative

d)

Mass = almost 0, Charge = negative

118.

What is an element?

a)

2 or more substance not chemically combined

b)

substance made of 1 type of atom

c)

substance made of more than one type of atom chemically joined together

d)

atoms of the same element with different number of neutrons

119.

What is an compound?

a)

2 or more substance not chemically combined

b)

substance made of 1 type of atom

c)

substance made of more than one type of atom chemically joined together

d)

atoms of the same element with different number of neutrons

120.

What is an mixture?

a)

2 or more substance not chemically combined

b)

substance made of 1 type of atom

c)

substance made of more than one type of atom chemically joined together

d)

atoms of the same element with different number of neutrons

121.

What is an isotope?

a)

2 or more substance not chemically combined

b)

substance made of 1 type of atom

c)

substance made of more than one type of atom chemically joined together

d)

atoms of the same element with different number of neutrons

122.

How many electrons can you put in the 1st, second and third electron shells?

a)

4,4,8

b)

2,8,8

c)

4,8,8

d)

1,2,8

123.
Is this ionic bond drawn correctly?
a)
Yes
b)
No
124.
Ionic bonds are between...
a)
Metal and Non-metal
b)
Non-metal and Non-metal
c)
Metal and Metal
125.
Atoms are most stable when their outer shell is complete.
a)
true
b)
false
126.
How are ionic bonds formed?
a)
Transfer of electrons
b)
Sharing of electrons
127.
Why do elements bond?
a)
To be friends
b)
To create a new element
c)
To become stable
128.
Atoms that gain electrons become...
a)
negatively charged
b)
positively charged
c)
remain neutrally charged
d)
21
129.

Why do all bonds form?

a)

so the number of protons equals the number of electrons

b)

so an atom can become unstable

c)

to fill the outermost energy level

130.

How many Aluminum atoms are in Al2O3?

a)

3

b)

5

c)

2

d)

1

131.

Write the correct formula for Sodium Chloride.

a)

SC

b)

SCl

c)

NaCl

d)

NaCl2

132.
When the number of electrons equals the number of protons the atom has what charge?
a)
sponge bob
b)
positive charge
c)
negative charge
d)
neutral charge
133.
In the chemical formula for an ionic compound, which item is written first?
a)
positive ion
b)
negative ion
c)
subscript
d)
the female
134.
Magnesium bromide is an ionic compound with the chemical formula MgBr₂.  What does the "2" tell you?
a)
There are 2 bromide ions for every magnesium ion
b)
Bromide has a 2- charge
c)
Bromide has a 2+ charge
d)
There are 2 magnesium ions to every bromide ion
135.
Which is the correct name for CaBr2?
a)
Calcium Bromine
b)
Bromine Calcium
c)
Calcium Bromide
d)
Carbon and Bromine
136.
Metals tend to 
a)
gain electrons
b)
lose electrons
137.
What is the correct formula for the compound, lithium oxide?
a)
LiO
b)
Li2O
c)
LiO2
d)
Li2O2
138.

What is the charge of ion "X" in the formula XF3?

a)

+3

b)

-3

c)

+1

d)

-1

139.

What is the charge of ion "X" in CaX?

a)

+1

b)

-1

c)

+2

d)

-2

140.

Which of the following pairs of elements will NOT form an ionic compound?

a)

sodium and fluorine

b)

phosphorous and aluminum

c)

potassium and magnesium

d)

strontium and oxygen

141.
A charged particle that has gained or lost electrons is called a _____.
a)
molecule
b)
ion
c)
isotope
d)
element
142.
A cation is a ____ ion.
a)
negative
b)
positive
c)
neutral
d)
ficticious
143.
A anion will be a ____ ion.
a)
negative
b)
positive
c)
neutral
d)
ficticious
144.
An ionic bond is the attraction between:
a)
oppositely charged ions
b)
similarly charged ions
c)
neutral ions
d)
neutral atoms
145.
Write the correct chemical formula for Ag +  and  Br -
a)
AgBr
b)
silver bromide
c)
Ag2Br2
d)
gold bromide
146.
Write the correct formula for an ionic compound formed from S2- and Rb1+.
a)
SRb2
b)
SRb
c)
Rb2S
d)
RbS2
147.

What will be the charge of a bromine ion?

a)

+7

b)

-7

c)

-1

d)

+1

148.

Which element below would have a 3+ charge as an ion?

a)

nitrogen (N)

b)

boron (B)

c)

silicon (Si)

d)

argon (Ar)

149.
Mg2+ and Cl- create...
a)
Mg2Cl
b)
MgCl2
c)
Mg2Cl2
d)
MgCl
150.
Ca2+ and N3- create...
a)
Ca2N3
b)
Ca3N2
c)
CaN3
d)
Ca2N
151.

Na+ and Cl- create...

a)

Na2Cl

b)

NaCl2

c)

Na2Cl2

d)

NaCl

152.

Potassium and Sulfur create...

a)

KS

b)

KS2

c)

K2S

d)

K2S2

153.
Fe +2  and  SO4 -2
a)
FeSO4
b)
Fe4(SO4)2
c)
FeSO2
d)
correct answer is not given
154.

Metals tend to

a)

gain electrons

b)

lose electrons

155.

Nonmetals tend to

a)

gain electrons

b)

lose electrons

156.
If my charge becomes 2+ what does that say about me?
a)
I am stealing 2 electrons
b)
I am losing 2 electrons
c)
I am in period 2
d)
I have an atomic # of 2
157.
If I gain electrons I become
a)
Positive because I've added to my atom
b)
negative because I've added electrons
c)
same because i'm balanced
d)
equal because now I have electrons
158.
How do the following two elements bond together?
Na1+  F1-         
a)
NaF
b)
NaF3
c)
Na3F
d)
Na1F2
159.
How do the following two elements bond together?
Cr3+  O2-         
a)
CrO
b)
Cr3O2
c)
Cr2O3
d)
CrO3
160.
How do the following two elements bond together?
K1+  S2- 
a)
KS
b)
K8S
c)
K6S3
d)
K2S
161.
When an ionic compound is formed, its charge is 
a)
negative
b)
neutral (no charge)
c)
positive
162.

How does magnesium become an magnesium ion?

a)

it loses 2 electrons

b)

it gains 2 electrons

163.

How does calcium become an calcium ion?

a)

it loses 2 electrons

b)

it gains 2 electrons

164.

How does oxygen become an oxide ion?

a)

it loses 2 electrons

b)

it gains 2 electrons

165.

Which of the below is an ionic compounds?

a)

Ni

b)

MgCl2

c)

H2O

d)

CH4

166.
What is the atomic number of Rubidium?
a)
37
b)
44
c)
45
d)
86
167.
What is the atomic number of Oxygen?
a)
6
b)
7
c)
8
d)
9
168.
Elements which are shiny, conduct electricity and heat are called
a)
metal
b)
nonmetal
c)
metalloid
d)
nonexistent
169.

If an atom had the same properties as fluorine (F), it would probably be located in

a)

period 1.

b)

period 2.

c)

group 2.

d)

group 7.

170.
When an alkali metal reacts with water, the hydroxide produced dissolves to form and alkaline solution, True or False?
a)
True
b)
False
171.
What is the atomic number of lithium
a)
1
b)
2
c)
3
d)
4
172.
Which is the lightest alkali metal?
a)
Aluminium
b)
Hydrogen
c)
Lithium
d)
Potassium
173.
What is another name for the elements in group 7?
a)
The Halogens
b)
The Noble gases
c)
The Oxides
d)
The Alkali Metals
174.
Which of the following is NOT an alkali metal
a)
Li
b)
Cl
c)
K
d)
Cs
175.
What is formed when sodium reacts with water?
a)
sodium oxide and hydrogen
b)
sodium hydroxide and hydrogen
c)
sodium hydroxide and oxygen
d)
sodium hydroxide and carbon dioxide
176.
Which of the following is the most reactive in water?
a)
Lithium
b)
Sodium
c)
Potassium
177.
Alkali metals are found in which group of the periodic table?
a)
Group 1
b)
Group 2
c)
Group 7
d)
group 8 
178.

Group 1 elements only form ….. Ion

a)

1+

b)

1-

c)

2+

d)

2-

179.

What gas is given off when group 1 elements reacts with water?

a)

Hydrogen

b)

Oxygen

c)

Carbon dioxide

d)

Helium

180.

When a group 1 element reacts with water, a hydroxide is formed. What colour would Universal Indicator turn in this solution?

a)

Green

b)

Blue

c)

Yellow

d)

Red

181.

How many electrons are in the outer shell of group 1 elements?

a)

0

b)

1

c)

2

d)

3

182.

Why does the reactivity of group 1 elements increases down the group?

a)

It becomes more reactive

b)

It becomes easier to accept an electron

c)

It becomes easier to lose an electron

d)

It becomes less reactive

183.

what is your vallue leval

a)

10000

b)

3000

c)

9000

d)

5000

e)

20000

184.

As you move down the group, halogens' reactivity...

a)

increases

b)

decreases

c)

doesn't change

d)

shows no trend.

185.
What type of ions do the Group 7 elements make?
a)
positive 2 (+2)
b)
positive 1 (+1)
c)
negative 1 (-1)
d)
negative 2 (-2)
186.

How many electrons do the halogens all have in their outer shells?

a)

1

b)

2

c)

7

d)

8

187.

The Halogens are found in which group number?

a)

5

b)

6

c)

7

d)

0

188.

As you go down the group, how does the boiling point of the halogen elements change?

a)

Increases

b)

Decreases

c)

They're all about the same

189.

As you move down the group, halogens' reactivity...

a)

increases

b)

decreases

c)

doesn't change

d)

shows no trend.

190.

Which Halogen is the most reactive?

a)

Bromine

b)

Fluorine

c)

Iodine

d)

Chlorine

191.

In order to become stable do the halogens need to.....

a)

Gain an electron

b)

Lose an electron

192.

Which statement is true about halogens?

a)

Form covalent compounds with other non-metallic elements

b)

A less reactive halogen will displace a more reactive element form its ionic salt

c)

Form ionic compound with hydrogen

d)

form negative ion of charge -2

193.

The process by which solid iodine particles change directly to gas without first becoming a liquid is called ____.

a)

evaporation

b)

ionization

c)

condensation

d)

sublimation

194.

Which of the following is explosive

a)

fluorine and hydrogen

b)

chlorine and hydrogen

c)

iodine and hydrogen

d)

bromine and hydrogen