Question

what are 'groups'of the modern periodic table what does the 'group number' signify.​

Answer 1

Answer:

The group number in the periodic table represents number of valence electrons of the elements in a certain group. For example, all the elements in Group−1 have 1 electron in their outer most shell

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Answer 2

Answer:

Groups are vertical columns. Group number signifys the no. of electrons in the outer shell (valence electrons).