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WorksheetsAtomic Number and Atomic Mass
Total questions: 20
Worksheet time: 15mins
Name
Class
Date
1.
What is the mass number defined as?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
2.
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
3.
What is the atomic number of this atom?
a)
1
b)
3
c)
4
d)
7
4.
The fluorine atom has an atomic number of
a)
19
b)
9
5.
What is the mass number and atomic number ?
a)
Mass number = 7, atomic number = 14
b)
Mass number = 14, atomic number = 7
6.
Which particle has a positive charge?
a)
electron
b)
orbital
c)
proton
d)
neutron
7.
Choose the particle that has no charge.
a)
nucleus
b)
neutron
c)
proton
d)
electron
8.
How many electrons are there in one atom of magnesium?
a)
12
b)
6
c)
24
9.
What is the number of protons in Magnesium atom ?
a)
12
b)
24
c)
23
d)
8
10.
What is the number of electrons in chlorine atom ?
a)
35
b)
11
c)
18
d)
17
11.
How many Neutrons are present in the Sodium atom ?
a)
12
b)
11
c)
0
d)
23
12.
An element has the mass number 12 and atomic number 6. The number of neutrons in it is:
a)
6
b)
10
c)
4
d)
8
13.
A phosphorus atom has 15 protons and 16 neutrons. What is the mass number?
a)
15
b)
16
c)
31
d)
1
14.
An atom of argon has 18 protons and 22 neutrons. How many electrons does it have?
a)
18
b)
22
c)
40
d)
4
15.
Oxygen has 8 protons. What is oxygen's atomic number?
a)
16
b)
8
c)
15.999
d)
0
16.
Can you round the atomic mass?
a)
Yes, always round the mass
b)
No, never round the mass
c)
Depends on which element
d)
Only round if the number increases
17.
What is the name of this element?
a)
Lithium
b)
Boron
c)
Carbon
d)
Neon
18.
What is the name of this element?
a)
Helium
b)
Hydrogen
c)
Argon
d)
Silver
19.
Which element is this?
a)
Calcium
b)
Chlorine
c)
Silicon
d)
Potassium
20.
The number in the upper corner of an element tile (7 for nitrogen) is called _____
a)
the proton number
b)
the atomic number
c)
the electron number
d)
the mass number
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