In atom with atomic number 20 is most likely to
ombine chemically with the atom whose atomic
number is
1) 3
(2) 11
(4) 18
-3) 17
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Answer 3) 17
Explanation:
An atom with Atomic number 20 has electronic configuration 2,8,8,2 means if it donate 2 electron to some other element then it can get stability.
On other hand element with Atomic number 17 has electronic configuration 2,8,7 means it requires 1 electron more to attain stability.
The first element combined with 2 atoms of second element and form the compound with molecular formula of compound is CaCl2.
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