Question

what is the meant in the periodic table by (a) a group (b) a period

Answer 1

⏺heya friend !.

✔here's your answer :-

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⚫in periodic table , there are 7 horizontal columns , which are known as periods.
and there are 18 vertical columns known as groups.
⚫moving left to right in a period, number of valence electrons increase by one but valence shells remains the same.
⚫in case of moving up to down in a group, number of valence electrons remains same and valence shells increase by one.

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i hope it helps u !!!☺