Three elements A,B and C have 3,4and 2electron respectively in their outermost shell give the group number to which they belong in the modern periodic table.also given their valancies
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the three elements A B and C are Lithium beryllium and helium and their valencies are 1,2 and 2 respectively Lithium belong to first Agroup , beryllium belong to secondary Agroup and William belong to zero group 18 groups
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