What is meant by group and period ?
GSEB - Class 9 Chapter - 3.Periodic Classification of Elements Page 32
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Henry Moseley who discovered modern periodic table. in which he discover periods and groups.
groups - this periodic table has 18 vertical columns known as groups.
period- 7 horizontal rows known as periods
groups - this periodic table has 18 vertical columns known as groups.
period- 7 horizontal rows known as periods
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