
Concept explainers
Interpretation:
The given statement is to be completed.
Concept introduction:
Negative ions are formed when an atom gains electrons. The atom after gaining the electrons becomes anion.

Answer to Problem 18A
Non-metals form negative ions by gaining enough electrons to achieve noble gas configuration.
Explanation of Solution
This can be seen with an example:
Bromine is a non-metal which belongs to 17th group.
Electronic configuration of
Thus it has deficiency of one electron to achieve noble gas configuration. So it has tendency to gain one electron and form most stable ion
Therefore, Electronic configuration of
Which is equivalent to krypton.
Thus, non-metal forms anions by gaining electrons.
Chapter 12 Solutions
World of Chemistry, 3rd edition
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