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State the number of electrons that are gained by atoms of each of the following to...

State the number of electrons that are gained by atoms of each of the following to obtain a stable electron configuration.

1. Cl

2. Se

3.S

4. O

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Answer #1

1. Cl gains 1 electron to get a stable electron configuration of Ar .

2. Se gains 2 electrons to obtain the stable electron configuration of Kr .

3. S gains 2 electrons to get a stable electron configuration of Ar .

4. O gains 2 electrons to get a stable electron configuration of Ne .

These type of questions are answered by knowing the group of the elements of which they are member. Group 16 elements require 2 electrons whereas group 17 elements require 1 electron to achieve stable electron configuration of noble gases .

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