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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
- Element A has 3 valance electrons so, its valency is 3 and it belongs to group 13 in the modern periodic table.
- Element B has 4 valance electrons so, its valency is 4 and it belongs to group 14 in the modern periodic table.
- Element C has 2 valance electrons so, its valency is 2 and it belongs to group 2 in the modern periodic table.
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