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WorksheetsAtomic Structure
Total questions: 29
Worksheet time: 16mins
Name
Class
Date
1.
Electrons have virtually no mass (weight).
a)
True
b)
False
2.
What is the atomic number?
a)
The number of protons in an element
b)
The number of neutrons in an element
c)
The number of protons and neutrons.
d)
The number of protons and electrons.
3.
What is the atomic number of an element with 12 protons, 13 neutrons and 12 electrons?
a)
12
b)
13
c)
25
d)
24
4.
Changing the number of electrons in an atom changes its...
a)
element type.
b)
charge.
c)
isotope type.
d)
atom type.
5.
Changing the number of neutrons in an atom changes its...
a)
element type.
b)
mass (weight).
c)
charge.
d)
atom type.
6.
How many protons are in an atom of carbon?
a)
12.01
b)
8
c)
6
d)
14
7.
How many electrons does a neutral carbon atom have?
a)
0
b)
2
c)
14
d)
6
8.
When there are the same number of protons and electrons in an atom, that atom is a...
a)
positive ion.
b)
negative ion.
c)
unstable isotope.
d)
neutral atom.
9.
Which is an electron?
a)
A
b)
B
c)
C
10.
Which is a proton?
a)
A
b)
B
c)
C
11.
Which is a neutron?
a)
A
b)
B
c)
C
12.
An element can be defined by the number of ___________ in the nucleus of its atoms.
a)
protons
b)
neutrons
c)
electrons
d)
atoms
13.
What parts of the atom make up most of its mass?
a)
protons and electrons
b)
protons and neutrons
c)
neutrons and electrons
d)
electrons
14.
What is the atomic mass number?
a)
the number of protons in an element
b)
the number of neutrons in an element
c)
the number of protons and neutrons
d)
the number of protons and electrons
15.
What is the mass of a proton?
a)
about 1/1800th of an amu
b)
0 amu
c)
1 amu
d)
2/3 amu
16.
What is the mass of a neutron?
a)
about 1/1800th of an amu
b)
0 amu
c)
1 amu
d)
2/3 amu
17.
When there are more protons than electrons in an atom it is a...
a)
positive ion.
b)
negative ion.
c)
unstable isotope.
d)
neutral atom.
18.
Lithium-5 isotope (atomic mass=5) has how many neutrons?
a)
5
b)
1
c)
2
d)
3
19.
Which of these would change an atom into a different element?
a)
Change the number of neutrons.
b)
Change the number of protons.
c)
Change the number of electrons.
20.
Where are protons located in an atom?
a)
nucleus
b)
electron cloud
c)
neutron
d)
who knows?
21.
Where are neutrons located within an atom?
a)
nucleus
b)
electron cloud
c)
neutron
d)
who knows?
22.
Where are electrons located in an atom?
a)
nucleus
b)
electron cloud
c)
neutron
d)
who knows?
23.
The number of protons is equal to the
a)
atomic mass
b)
atomic number
c)
atomic structure
d)
atomic link
24.
Iron (Fe) has an isotope that has 29 neutrons. What's Iron's mass number?
a)
26
b)
55
c)
56
d)
27
25.
What is the name of the positively charged particle found in the center of the atom?
a)
proton
b)
electron
c)
neutron
26.
If you alter the number of neutrons in an atom, what do you create?
a)
ions
b)
isotopes
c)
atoms
d)
radioactivity
27.
What number defines the element?
a)
atomic mass
b)
mass number
c)
neutrons
d)
atomic number
28.
An atom's protons and neutrons are concentrated in a dense, central region called the...
a)
electron cloud
b)
nucleus
c)
proton
d)
neutron
29.
An atom with more protons than electrons OR more electrons than protons is called a(n)...
a)
isotope
b)
lil' sparky
c)
ion
d)
radioisotope
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