Three elements A, B and C have 3, 4 and 2

Question:

Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern

Periodic Table. Also, give their valencies.

Solution:

The electrons present in the outermost shell are also known as valence electrons. The desired information is given :

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