Periodic Table
3
Li
7
13
Al
27
25
Mn
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55
No. of neutrons =
53
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I
127
36
Kr
84
29
Cu
63
No. of neutrons =
29
Cu
65
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17
Cl
35.5
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Isotopes
Calculate the average atomic mass for the following elements.
Boron has two naturally occurring isotopes.
80% of all Boron is B11 (6 neutrons)
20% of all Boron is B10 (5 Neutrons)
Average atomic mass =
Closest whole number =
Copper has two naturally occurring isotopes.
69% of all Copper is Cu63 (34 neutrons)
31% of all Copper is Cu65 (36 Neutrons)
Average atomic mass =
Closest whole number =
Magnesium has three naturally occurring isotopes.
79% of all Magnesium is Mg24 (12 neutrons)
11% of all Magnesium is Mg25 (13 Neutrons)
10% of all Magnesium is Mg26 (14 neutrons)
Average atomic mass =
Closest whole number =
Nickel has five naturally occurring isotopes.
68% of all Nickel is Ni58 (30 neutrons)
26% of all Nickel is Ni60 (32 Neutrons)
1% of all Nickel is Ni61 (33 neutrons)
4% of all Nickel is Ni62 (34 Neutrons)
1% of all Nickel is Ni64 (36 neutrons)
Average atomic mass =
Closest whole number =