
Concept explainers
Interpretation:
The reason for the elements in the same group in the periodic havingsimilar properties needs to be explained.
Concept introduction:
Vertical columns are known as groups in the periodic table. There are 18 groups in the long form of periodic table.

Answer to Problem 1TAI
As chemical properties are controlled by valence electrons thus elements belonging to same group of periodic table have similar properties.
Explanation of Solution
Valence shell electrons participate in
Due to similar outer electronic configuration, elements belonging to same groups have similar properties.
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