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1
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The atomic mass tells the average mass of the atoms of an element, while the atomic
number is the protons in the nucleus of an atom
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What is an isotope? Give examples
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3
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4
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What is the atomic number of Chlorine? 17
5
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If the mass number of a Chlorine atom is 37, how many neutrons does it have? 20
7
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If an ion of Chlorine has the symbol Cl1-, how many electrons does it have? 33
Isotope
symbol
14
6
109
47
114
50
117
50
C
Ag1+
S
n
S
n
81
35
Br1-
42
20
Ca2+
Element
name
Atomic
number
Mass
number
Number of
protons
Number of
neutrons
Number of
electrons
Carbon
6
14
6
8
6
Silver
47
109
47
62
46
Tin
50
114
50
64
114
Tin
50
117
50
67
119
Bromine
35
81
35
46
79
Calcium
Ion
20
42
20
22
40