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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.

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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i) Element A has 3 electrons in the outer most shell therefore its valency is 3. So element A can be one of the following: B, Al, Ga, In , Tl
ii) Element B has 4 electrons in the outer most shell therefore its valency is 4. So element B can be one of the following: C, Si, Ge, Sn, Pb
iii) Element C has 2 electrons in the outer most shell therefore its valency is 2. So element C can be one of the following: Be, Mg, Ca, Sr, Ba, Ra

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