WorksheetsSub-atomic Particles: Ions and Isotopes
Total questions: 18
Worksheet time: 15mins
Name
Class
Date
1.
The dense, positively charged mass located in the center of the atom.
a)
nucleus
b)
proton
c)
isotope
d)
molecule
2.
Atoms of the same element must always have the same number of _________
a)
electrons
b)
neutrons
c)
isotopes
d)
protons
3.
The __________ of an atom is the sum of the protons and neutrons in the nucleus of that atom.
a)
mass number
b)
atomic number
c)
atomic weuight
d)
isotope weight
4.
Two atoms of the same element but with different mass numbers are called________
a)
electrons
b)
isotopes
c)
variables
d)
electron cloud
5.
How many protons are in this element?
a)
79
b)
196
c)
117
d)
Cannot be determined
6.
How many protons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?
a)
20
b)
10
c)
2
d)
18
7.
Isotopes are elements with a different amount of
a)
protons
b)
neutrons
c)
electrons
d)
atoms
8.
How many neutrons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?
a)
20
b)
25
c)
2
d)
18
9.
How many electrons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?
a)
20
b)
45
c)
18
d)
2
10.
How many electrons are in an atom that has an atomic number of 34, an atomic mass of 74 and a charge of -2?
a)
34
b)
36
c)
2
d)
40
11.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
12.
Which particle does not contribute mass to the atom?
a)
Proton
b)
Neutron
c)
Electron
d)
Nucleus
13.
What particle provided the positive charge for an atom?
a)
proton
b)
neutron
c)
electron
d)
nucleus
14.
What do these isotopes of carbon all have in common?
a)
neutrons & mass number
b)
atomic number and neutrons
c)
atomic number and electrons
d)
protons, atomic number, and mass number
15.
What element is this? What is the mass number of this atom?
a)
sodium, 23
b)
magnesium, 23
c)
magnesium, 12
d)
sodium, 11
16.
How many neutrons does uranium-235 have?
a)
238
b)
92
c)
146
d)
143
17.
The smallest part of an element is known as the
a)
Periodic Table
b)
Atom
c)
Group
d)
Period
18.
How many protons are in Mn?
a)
12
b)
25
c)
42
d)
54
100 %
