a. 24, 24, 24
b. Scandium, 21
c. Yttrium, 39, 39
d. 87, 87
e. 36, 36
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Answers & Comments
a. 24, 24, 24
b. Scandium, 21
c. Yttrium, 39, 39
d. 87, 87
e. 36, 36