Question

An atom with atomic number 20 is most likely to
combine chemically with the atom whose atomic
number is
(1) 3
(2) 11
(3) 17
(4) 18​

Answer 1

Answer:

The atom with atomic number 20 is Calcium

Explanation:

It can combine with nonmetals and the non metals given in the options is 17; i.e Chlorine

it forms CaCl2

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