WorksheetsStructure of an atom
Total questions: 20
Worksheet time: 17mins
Name
Class
Date
1.
What is the atomic number?
a)
number of protons
b)
number of neutrons
2.
Which element has 31 protons ?
a)
Gallium
b)
Germanium
c)
Gadolinium
d)
Polonium
3.
What number indicates the nucleus?
a)
1
b)
2
c)
3
d)
4
4.
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
5.
What number indicates an electron?
a)
1
b)
2
c)
3
d)
4
6.
Which statement best describes an electron?
a)
Smaller mass than a proton and a negative charge
b)
Smaller mass than a proton and a positive charge
c)
Greater mass than a proton and a negative charge
d)
Greater mass than a proton and a positive charge
7.
Which two particles make up the nucleus of an atom?
a)
Protons and Electrons
b)
Protons and Neutrons
c)
Molecules and Compounds
d)
Neutrons and Electrons
8.
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.
9.
The particles with no charge in an atom are the _______.
a)
electrons
b)
neutrons
c)
protons
d)
protons and neutrons
10.
The positively charged particles of an atom are the ________.
a)
electrons
b)
protons
c)
neutrons
d)
protons & neutrons
11.
The negatively charged particles of an atom are the ______.
a)
electrons
b)
protons
c)
neutrons
d)
protons & neutrons
12.
Like charges attract.
a)
true
b)
false
13.
Opposite charges repel.
a)
true
b)
false
14.
A negatively charged object has lost protons.
a)
true
b)
false
15.
A positively charged object has gained protons.
a)
true
b)
false
16.
Who came up with the idea for the 'plum pudding' atomic structure?
a)
Dalton
b)
J.J. Thomson
c)
Rutherford
d)
Bohr
17.
What did Rutherford discover?
a)
Electrons
b)
Electrons move around the nucleus in orbits of fixed size and energy
c)
Atoms are mostly empty space with a positive nucleus at the centre
18.
Who discovered that electrons move around the nucleus in orbits of fixed size and energy?
a)
Dalton
b)
J.J. Thomson
c)
Rutherford
d)
Bohr
19.
What year did J.J. Thomson publish his work?
a)
1804
b)
1904
c)
1803
d)
1994
20.
How many electrons are in the atom pictured?
a)
1
b)
2
c)
3
d)
0
100 %
