Concept explainers
Interpretation:
The formation of ions by alkali metals and halogens needs to be explained.
Concept introduction:
Many atoms do not have eight electrons in its outermost shell. There may be less than 8 electrons indicating that there is deficiency of 1 or 2 electrons. If atoms gain electrons it becomes positively charged ions and if it gains electrons, it becomes negatively charged ions. Octet rule is applied to each element to get a stable configuration wherein there needs to be 8 outermost electrons.

Answer to Problem 48A
The alkali metal will lose one electron to form an ion while halogen will gain one electron to form an ion such that it attains octet configuration..
Explanation of Solution
Alkali metals are those elements which belong to group 1. Halogens are those elements which belong to group 17.
The electronic configuration of alkali metals is
The electronic configuration of halogens is
Thus, alkali metal will lose one electron to form an ion while halogen will gain one electron to form an ion.
The alkali metal will lose one electron to form an ion while halogen will gain one electron to form an ion such that it attains octet configuration.
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