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8th Grade Unit 2 Review

Total questions: 47

Worksheet time: 32mins

Name
Class
Date
1.
all matter is made of what 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
2.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
3.
the central region of an atom where its neutrons and protons are is its 
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
4.
an atom with atomic number 6 would have how many protons 
a)
6
b)
12
c)
3
d)
cannot be determined 
5.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
6.
What is the atomic number for an element with three protons?
a)
2
b)
1
c)
3
d)
6
7.
A particle that moves around the nucleus is a(n)...
a)
Proton
b)
Neutron
c)
Electron
d)
Quark
8.
In the modern periodic table elements are arranged by:
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
9.
What does the 1.00794 stand for?
a)
Hydrogen
b)
atomic number
c)
atomic mass
d)
atomic explosion
10.
What is the atomic mass of "F"
a)
9
b)
18
c)
17
d)
19
11.
The first energy level can hold up to how many electrons?
a)
8
b)
4
c)
2
d)
5
12.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
13.
An atoms overall charge is 
a)
positive 
b)
depends on its mood 
c)
neutral 
d)
negative 
14.
The particles that are found in the nucleus of an atom are
a)
neutrons and electrons
b)
electrons only
c)
protons and neutrons
d)
protons and electrons
15.
Where are electrons of an atom found?
a)
Nucleus
b)
Electron Cloud
c)
Some are in the nucleus and some in the electron cloud.
d)
They are moving everywhere.
16.
What is the atomic symbol for sodium?
a)
Na
b)
So
c)
NaCl
d)
S
17.
Most of the mass in an atom is concentrated in the...
a)
electrons
b)
nucleus
c)
protons
d)
empty space
18.
How many neutron are in the atom "K"?
a)
7
b)
2
c)
39
d)
20
19.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
20.
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
21.
What particle uniquely identifies an element?
a)
Number of Valence Electrons
b)
Number of Protons
c)
Number of Electrons
d)
Atomic Mass
22.
Which one of these is NOT located in the element square on the Periodic Table?
a)
Atomic Number
b)
Atomic Mass
c)
Room Temperature
d)
Chemical Symbol
23.
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
24.
If an atom has 10 protons, 10 neutrons, and 10 electrons, what is the mass of the atom?
a)
10
b)
20
c)
30
25.
Which subatomic particles contribute the most to the mass of an atom?
a)
Protons, Neutrons, Electrons
b)
Protons only
c)
Protons and Electrons
d)
Protons and Neutrons
26.
What is the atomic number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
27.
What is the mass number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
28.
What is the chemical symbol for Chlorine
a)
C
b)
Cl
c)
Ch
d)
Ce
29.
Atoms are mostly filled with?
a)
electrons
b)
empty space
c)
protons
30.

Which element has the same number as valence electrons as the one shown above ?

a)

Iodine

b)

Neon

c)

Calcium

d)

Bromine

31.

How many valence electrons does Xenon have?

a)

54

b)

8

c)

2

d)

131

32.

Which element has 5 valence electrons ?

a)

Lead

b)

Boron

c)

Carbon

d)

Bismuth

33.

What element is represented here ?

a)

Al

b)

P

c)

Si

d)

Be

34.

How many valence electrons are represented in this element ?

a)

4

b)

6

c)

2

d)

0

35.

A substance made up of two or more chemically combined elements is __.

a)

an element

b)

a mixture

c)

a compound

d)

a solution

36.

NaHCO3 is an example of __

a)

an abbreviation

b)

a compound

c)

a mixture

d)

an element

37.

What is an example of a mixture?

a)

table salt

b)

salt water

c)

oxygen

d)

HCl

38.

What is an example of an element?

a)

Air

b)

Pure water

c)

table salt

d)

Helium

39.

What cannot be broken down into other substances?

a)

compound

b)

mixture

c)

solids

d)

element

40.

How many elements are represented in the compound? Na2CO3

a)

1

b)

2

c)

3

d)

4

41.

Mixtures are separated through ___ changes.

a)

mixture

b)

compound

c)

physical

d)

ongoing

42.

At element is made up of only one kind of __.

a)

isotope

b)

plastic

c)

atom

d)

metal

43.

Vertical (up and down) columns in the periodic table are called ___ of elements and have similar properties.

a)

groups

b)

periods

c)

arrangements

d)

tiles

44.

The horizontal (left to right) rows on the periodic table are known as __.

a)

periods

b)

atoms

c)

groups or families

d)

valence electrons

45.

What is H2SO4 made up of?

a)

2 hydrogen, 1 sulfur, 4 oxygen

b)

1 hydrogen, 2 sulfur, 4 oxygen

c)

2 hydrogen & 4 sodium

d)

1 hydrogen and 6 sodium

46.

The blue numbers in the image below are called __.

a)

compounds

b)

coefficients

c)

subscripts

d)

chemical formulas

47.

How many ATOMS are there TOTAL in: H2SO4

a)

6

b)

5

c)

3

d)

7

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