WorksheetsIsotopes
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
5
2.
If a hydrogen atom has 1 proton, 1 electron, and 1 neutron, its atomic number is:
a)
1
b)
2
c)
3
3.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
4.
If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:
a)
16
b)
32
c)
48
5.
What is the name of the pictured isotope?
a)
Copper-29
b)
Copper-63
c)
Copper-34
d)
CopperWopperHopperBopper
6.
Which of the following are isotopes?
a) 14 7X b) 14 6X c) 15 7X d) 15 8X
a)
a) and b)
b)
a) and c)
c)
c) and d)
d)
a) and d)
7.
If X is the symbol for an element, which of the following two symbols represent isotopes of the same element? I. 7735X II. 7733X III. 8137X IV. 8135 X
a)
I and II
b)
III and IV
c)
I and IV
d)
I and III
8.
How is carbon-12 different from carbon-14?
a)
They have a different number of protons
b)
they have a different number of electrons
c)
they have a different number of neutrons
9.
What do carbon-12 and carbon-14 have in common?
a)
they have same number of protons
b)
they have the same number of neutrons
c)
they have the same atomic mass
d)
they have the same atomic weight
10.
What can you conclude about carbon-14 from its name?
a)
It has 14 electrons
b)
it has 14 neutrons
c)
it has 14 protons
d)
it has an atomic mass of 14 u
11.
12 protons and 13 neutrons
a)
Mg-12
b)
Mg-13
c)
Mg-25
d)
Mg-24.305
12.
How many neutrons are in the following atom?
a)
47
b)
61
c)
108
d)
155
13.
How many protons are in the following atom?
a)
82
b)
125
c)
207
d)
189
14.
What is the name of the pictured isotope?
a)
Chlorine-Schmorine
b)
Chlorine-17
c)
Chlorine-35
d)
Chlorine-18
15.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
47
16.
These three isotopes of carbon have different -
a)
Atomic numbers
b)
Mass numbers
c)
Numbers of protons
d)
Symbols
17.
Which of these determines the identity of an atom?
a)
proton
b)
neutron
c)
valence electron
d)
protons and neutrons
18.
_______ are atoms with the same number of protons but varying numbers of neutrons.
a)
ions
b)
elements
c)
allotropes
d)
isotopes
19.
What is a mass number?
a)
The average atomic mass
b)
the number of protons and neutrons in the nucleus
c)
the number of protons in the nucleus
d)
the number of protons and electrons in the nucleus
20.
What is the name of the isotope with 54 protons and 79 neutrons?
a)
Xenon-79
b)
Gold-79
c)
Gold-133
d)
Xenon-133
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