Question

the atomic number of three elements A, B and C 9,12, and 16 respectively. Which of them form cation​

Answer 1

Element B will form cation to acquire nearest noble gas configuration of neon.

Answer 2

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Element B - Magnesium

Explanation:

Cations are positive ions. All metals form cations.

Elements

9 - fluorine

12 - magnesium

16 - sulphur

Magnesium donates 2 electrons and is a metal hence it will be a cation