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Name: ________________
Period: ________________
Date: ________________
Reading & Processing Information From
The Periodic Table
Name of
Isotope
Isotope’s
Symbol
Sodium
22
11 Na
Atomic
Number
Mass
Number
# of
protons
# of
electrons
# of
neutrons
11
22
11
11
11
22
24
81
35
10
5
30
37
7
6
79
35 Br
Silver
107
43
20 Ca
16
16
13
128
54 Xe
14
128
Steps for processing information:
1. Atomic Number represents the number of protons (+ charges), as well as the number of
electrons (- charges) in an atom of the element.
2. Mass Number represents the number of subatomic particles in the nucleus of an atom of the
element, ie. protons plus neutrons (no charge).
Mass Number - Atomic Number = # of n_________
Mass Number - # of neutrons = # of p_________ (and/or # of electrons)
Mass Number - # of neutrons = A___________ ___________
3. Isotope's symbol is the mass number written above the atomic number located to the left of the
element's symbol (see the sample for sodium).
Name: ________________
Period: ________________
Date: ________________
Reading & Processing Information From
The Periodic Table
Name of
Isotope
Magnesium-26
Isotope’s
Symbol
26
12 Mg
Atomic
Number
Mass
Number
# of
protons
# of
electrons
# of
neutrons
12
26
12
12
14
24
54
80
36
Carbon-12
28
36
52
24 Cr
8
10
Silver-109
Chromium-50
24
26
Silicon-30
2
1
Lead-207
Steps for processing information:
1. Atomic Number represents the number of protons (+ charges), as well as the number of
electrons (- charges) in an atom of the element.
2. Mass Number represents the number of subatomic particles in the nucleus of an atom of the
element, ie. protons plus neutrons (no charge).
Mass Number - Atomic Number = # of n_________
Mass Number - # of neutrons = # of p_________ (and/or # of electrons)
Mass Number - # of neutrons = A___________ ___________
3. Isotope's symbol is the mass number written above the atomic number located to the left of the
element's symbol (see the sample for sodium).