The elements a, b, c, d have the following electron configurations. Then the elements that belong to the same group of periodic table is
The elements a, b, c, d have the following electron configurations. Then the elements that belong to the same group of periodic table is
a) 2,3
b) 2,8,3
c) 2,8,5
d) 2,8,7
A) a, b
B) b, c
C) c, d
D) d, a
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