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Atomic structure, valency and molecular formula

Total questions: 48

Worksheet time: 36mins

Name
Class
Date
1.

Electrons revolve around the nucleus in fixed 'orbits' called...

a)

Energy Levels

b)

Nucleus Orbit

c)

Orbit Levels

d)

Orbit's Energy

2.

Electrons revolve around the nucleus in imaginary paths called...

a)

Orbits

b)

Shells

c)

Paths

d)

Orbits or Shells

3.

What's the valency of Aluminium?

a)

2

b)

3

c)

8

d)

1

4.

Which is the atom that has stable electronic configuration?

a)

Nitrogen

b)

Oxygen

c)

Sodium

d)

Argon

5.

What's the valency of Chlorine?

a)

-2

b)

3

c)

-1

d)

-3

6.
What is the charge of a neutron?
a)
Positive
b)
Negative
c)
Neutral/no charge
7.
The atomic mass tells us how many ______ the atom has in its nucleus.
a)
Electrons and neutrons
b)
Protons and neutrons
c)
Protons and electrons
8.
The overall charge of an atom will be negative if there are.....
a)
More protons than electrons
b)
More electrons than protons
9.
The overall charge of an atom will be positive if there are....
a)
More protons than electrons
b)
More electrons than protons
10.
The period number tells us...
a)
How many electron shells an element has
b)
How many electrons are in the most outer shell
11.
The group number tells us...
a)
How many electron shells an atom has
b)
How many electrons are in the most outer shell of an element
12.

Na+ has 12 neutrons and 10 electrons. Which of the following statement is correct?

a)

Na+ has atomic number equal to 10 and mass number 22

b)

Na+ has atomic number equal to 11 and mass number 23

c)

Na+ has atomic number equal to 10 and mass number 23

d)

Na+ has atomic number equal to 11 and mass number 22

13.

How many electrons, protons and neutrons will be present in X–, if atomic number of X is 9 and mass number is 19 ?

a)

E = 9, P = 9, N = 10

b)

E = 10, P = 9, N = 10

c)

E = 10, P = 10, N = 10

d)

E = 9, P = 10, N = 10

14.

The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

a)

13

b)

10

c)

14

d)

16

15.

Valence electrons are located _____________ the nucleus of an atom

a)

close to

b)

farthest from

c)

randomly around

16.

Name the ionic compound, CaCO3

a)

calcium carbide

b)

calcium carbon trioxide

c)

calcium carbon oxide

d)

calcium carbonate

17.

Name the molecular compound CO

a)

carbon monoxide

b)

monocarbon monoxide

c)

carbide

d)

oxygen carbide

18.
H2SO4 - name?
a)
hydrogen sulfide
b)
hydrosulfuric acid
c)
hydrogen sulfide
d)
sulfuric acid
19.
What is the proper name for CaCl2?
a)
Calcium dichloride
b)
Monocalcium dichloride
c)
Calcium chloride
d)
Calcium chlorine
20.

What is the correct molecular formula for sodium nitrate?

a)

NaNO2

b)

Na3N

c)

Na3NO

d)

NaNO3

21.
What is the NAME of....
Na2S
a)
sodium sulfide
b)
disodium sulfide
c)
sodium sulfur
22.
What is the FORMULA for....
beryllium iodide
a)
Be2I
b)
BeI
c)
BeI2
d)
BI2
23.
The name of the compound NH4F is
a)
Nitrogen hydrogen fluorine
b)
Ammonium Fluoride
c)
Ammonia Fluoride
d)
Nitrogen tetrahydride fluoride
24.
The name of Al₂(SO₄)₃ is
a)

aluminum sulfur oxide

b)

aluminum sulfate

c)

aluminum trisulfate

25.
The name of Ca₃(PO₄)₂ is
a)
calcium phosphide oxide
b)
calcium phosphate
c)
tricalcium diphosphate
d)
carbon phosphate
26.
The name of Fe(OH)₂ is
a)

iron oxide

b)

ferrus hydroxide

c)

iron dihydroxide

d)

ferric hydroxide

27.
The chemical formula of sodium sulfate is
a)
S₂SO₄
b)
NaSO₂
c)
NaSO₄
d)
Na₂SO₄
28.
What is the formula for Magnesium Carbonate?
a)
MgCO3
b)
Mg(CO3)2
c)
Mg2CO6
d)
Mg2CO3
29.
Fe+3 combines with S-2 to form 
a)
Fe+4(S)=3
b)
Fe2S4
c)
Fe2S3
d)
Fe3S2
30.
What formula results when Fe+3 and CO3-2 ions bond?
a)
FeCO3
b)
Fe2CO3
c)
Fe2(CO3)3
d)
Fe3(CO3)2
31.
What is the name of K3PO4?
a)
Tripotassium Phosphate
b)
Tripotassium Phosphite
c)
Potassium phosphide
d)
Potassium phosphate
32.
What is the name of Al(NO3)3?
a)
Aluminum trinitrate
b)
Monoaluminum nitrate
c)
Aluminum (III) nitrate
d)
Aluminum Nitrate
33.
The proper formula for magnesium hydroxide:
a)
MgOH
b)
Mg2OH
c)
Mg(OH)2
d)
Mg2OH2
34.
If copper (II) and phosphate bond together, the resulting chemical formula would be:
a)
Cu2(PO4)3
b)
CuPO4
c)
Cu3(PO4)2
d)
Cu3PO4
35.
Ionic Compounds are made up of ions from ________ and _______.
a)
metals, metals
b)
nonmetals, nonmetals
c)
metals, nonmetals
d)
oxygen, carbon
36.
How are covalent bonds formed?
a)
Sharing of electrons
b)
Transfer of electrons
37.

What is the correct formula for potassium sulfide?

a)

K2S

b)

P2S

c)

KS2

d)

KS

38.

What is the correct formula for Beryllium fluoride?

a)

BeF

b)

Be2F

c)

BeF2

39.

Which is the correct formula for copper (II) fluoride?

a)

Cu2F

b)

CuF2

c)

CuF

40.

Which is the correct formula for Aluminum chloride?

a)

Al3Cl

b)

AlCl3

c)

AlCl

41.

Identify the formula for this combination Al3+ and O2-

a)

Al3O2

b)

AlO

c)

Al2O3

42.

Identify the formula for this combination Mg2+ and (NO2)1-

a)

Mg2(NO2)

b)

Mg(NO2)

c)

Mg(NO2)2

d)

MgNO4

43.

Identify the formula for this combination Ca and O

a)

Ca2O2

b)

CaO

c)

Ca2O

d)

CaO2

44.

Identify the formula for this combination Na and N

a)

Na3N

b)

NaN

c)

NaN3

45.

Which is the correct formula for Magnesium hydroxide (OH)1-?

a)

MgOH

b)

MgOH2

c)

Mg(OH)2

46.
Is salt NaCl a compound or a element?
a)
Element
b)
Compound
47.

A chemical formula is provided. How many atoms of hydrogen (H) are found in this substance?

a)

2

b)

4

c)

6

d)

8

48.

What is the correct formula for sodium oxide?

a)

NaO(s)

b)

NaN(s)

c)

NO(g)

d)

Na2O(s)

e)

N2O2(g)

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