WorksheetsGr9 Inside the Atom 2
Total questions: 15
Worksheet time: 1hrs 15mins
Name
Class
Date
1.
The smallest subatomic particles are:
a)
Electrons
b)
Elactrons
c)
Elictrons
d)
Olitrons
2.
The centre of an atom is the:
a)
Newcleus
b)
Nuclus
c)
Nuclues
d)
Nucleus
3.
Positively charged subatomic particles are called:
a)
Protins
b)
Protens
c)
Protons
d)
Protions
4.
Which of the following is a positively charged subatomic particle found in the nucleus of an atom?
a)
Electron
b)
Proton
c)
Neutron
d)
Quark
5.
An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?
a)
15
b)
31
c)
16
d)
47
6.
What is the Atomic Mass?
a)
6.941
b)
7
c)
3
d)
6
7.
How many Protons are in one atom of Lithium?
a)
3
b)
6
c)
7
d)
6.941
8.
An atom has 5 protons and 7 neutrons. What is the mass number of the atom?
a)
5
b)
7
c)
2
d)
12
9.
An atom has an atomic number of 19 and a mass number of 29. How many neutrons are in the atom?
a)
30
b)
19
c)
10
d)
38
10.
What number indicates an electron?
a)
1
b)
2
c)
3
d)
4
11.
Which element has 31 protons ?
a)
Gallium
b)
Germanium
c)
Gadolinium
d)
Polonium
12.
What is the mass number?
a)
the number of protons
b)
the sum of the number of protons and the number of neutrons in the nucleus of an atom
c)
the number of electrons
d)
the number of neutrons
13.
What is the atomic number?
a)
number of protons
b)
number of neutrons
14.
Oxygen’s atomic number is 8. This means that an oxygen atom must have
a)
8 electrons
b)
8 protons
c)
8 neutrons
d)
a mass number of 8
15.
What is the mass number of this element?
a)
5
b)
27
c)
32
d)
59
100 %
