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22/11/2020 4:27 pm
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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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22/11/2020 4:30 pm
Element - Valence electrons - Group number - Valency
A - 3 - 13 - 3
B - 4 - 14 - 4
C - 2 - 2 - 2