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.
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A- 3rd A group ,,valency-3
B- 4 A group,,valency-4
C-2 A group,,valency-2
B- 4 A group,,valency-4
C-2 A group,,valency-2
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