WorksheetsChemistry Atomic Structure
Total questions: 20
Worksheet time: 14mins
Name
Class
Date
1.
What is at the center of every atom?
a)
An electron
b)
A compound
c)
A molecule
d)
A nucleus
2.
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
3.
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.
4.
The particles with no charge in an atom are the _______.
a)
electrons
b)
neutrons
c)
protons
d)
protons and neutrons
5.
The positively charged particles of an atom are the ________.
a)
electrons
b)
protons
c)
neutrons
d)
protons & neutrons
6.
The negatively charged particles of an atom are the ______.
a)
electrons
b)
protons
c)
neutrons
d)
protons & neutrons
7.
An electron has this charge
a)
positive
b)
negative
c)
neutral
8.
A neutron has this charge
a)
negative
b)
positive
c)
neutral
9.
A proton has this charge
a)
negative
b)
positive
c)
neutral
10.
A particle that moves around the nucleus is a(n)...
a)
Proton
b)
Neutron
c)
Electron
d)
Quark
11.
The center of an atom that holds protons and neutrons?
a)
model
b)
electron
c)
nucleus
d)
neutron
12.
What does the nucleus of an atom contain?
a)
Electrons and neutrons
b)
Protons and neutrons
c)
Neutrinos and positrons
d)
DNA and RN
13.
What number indicates an electron?
a)
1
b)
2
c)
3
d)
4
14.
What number indicates the nucleus?
a)
1
b)
2
c)
3
d)
4
15.
Which element has 31 protons ?
a)
Gallium
b)
Germanium
c)
Gadolinium
d)
Polonium
16.
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
17.
What is the atomic number?
a)
number of protons
b)
number of neutrons
18.
Which element has 31 protons ?
a)
Gallium
b)
Germanium
c)
Gadolinium
d)
Polonium
19.
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
20.
What is the mass number of this element?
a)
5
b)
27
c)
32
d)
59
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