a metal has an atomic number of ?
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Answer:
Elements having 1,2 or 3 electrons in its last shell act as metals.
32=[Ar]3 d
10
4s
2
p
2
34=[Ar]3 d
10
4s
2
p
4
36=[Ar]3 d
10
4s
2
p
6
38=[Ar]3 d
10
4s
2
p
6
,5s
2
In the above electronic configuration, the last electron enters into 5s orbital, hence it is an alkaline earth metal.
Thus option D is correct.
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