
Interpretation:
For main group elements, the change in core elements across the period needs to be explained.
Concept introduction:
Core electrons are those which are in the innermost orbit and do not participate in the

Answer to Problem 5E
Across a period number, number of core electrons remains the same for main group elements.
Explanation of Solution
While going across a period from left to right, the number of valence electrons increases but number of core electrons remains same.
For example from Li to Ne, the number of core electrons is 2 but valence electrons changes from 1 to 8.
Core electrons remains same across a period.
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