Chemistry, asked by karishma, 5 months ago

Why Lithium with atomic number 3 and Sodium with atomic number 11 are placed in group one?

And What will be the atomic numbers of first two elements of second group?

Answers

Answered by srivastavpranav3136

3

Answer:

lithium and sodium are placed in same group group one because they have same number of valence electrons(1)

Be-atomic no.4

Mg atomic no 12

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