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Atoms - Isotopes

Total questions: 25

Worksheet time: 20mins

Name
Class
Date
1.
The central region of an atom where its neutrons and protons are is its 
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
2.
An atom with atomic number 6 would have how many protons 
a)
6
b)
12
c)
3
d)
cannot be determined 
3.
Most of the mass in an atom is concentrated in the...
a)
electrons
b)
nucleus
c)
protons
d)
empty space
4.
What does the nucleus consist of?
a)
Protons + Electrons
b)
Neutrons + Electrons
c)
Atoms
d)
Protons + Neutrons
5.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
6.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
7.
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
8.
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.
9.
Which of the following determines the type of element that an atom makes?
a)
size of the nucleus
b)
number of protons
c)
how much the atom weighs
d)
number of neutrons
10.

Where is the element's atomic NUMBER located?

a)

the top

b)

the bottom

c)

the top + the bottom

d)

the number of protons + the number of neutrons

11.

Where is the element's atomic MASS located?

a)

at the top

b)

at the bottom

c)

the top number + the bottom number

d)

the number of protons + the number of neutrons

12.

Generally, the number of neutrons ____ the number of protons in an atom.

a)

=

b)

<

c)

>

13.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
14.
What is the atomic mass of "F"
a)
9
b)
18
c)
17
d)
19
15.

Which subatomic particles contribute the most to the mass of an atom?

a)

Protons and Neutrons

b)

Protons only

c)

Electrons only

16.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
17.

Why is the overall charge of an atom neutral (0)?

a)

They have the same number of protons and neutrons.

b)

They have the same number of protons and electrons.

c)

They have the same number of electrons and neutrons.

18.

What is the number of electrons?

a)

13

b)

14

c)

26.98

d)

27

19.

What is the difference between Neon-20 and Neon-22?

a)

They have different numbers of electrons.

b)

They have different numbers of neutrons.

c)

Only 1 is radioactive.

d)

No difference.

20.

Which atom of these isotopes has 3 protons? The symbol for lithium is Li.

a)

Lithium-6

b)

Lithium-7

c)

All of them.

d)

Lithium-9

21.

Which is the correct symbol for Fluorine-18?

a)
b)
c)
d)
22.

How many neutrons are in this isotope?

a)

20

b)

41

c)

61

d)

21

23.
What is an isotope? 
a)
A charged atom
b)
An atom with different amounts of neutrons
c)
An atom with different amounts of protons
d)
A neutral atom
24.
Different isotopes have...
a)
different masses
b)
different atomic numbers
c)
different electrons
d)
different protons
25.
How many neutrons does an Oxygen-19 isotope have?
a)
19
b)
8
c)
11
d)
10

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