1.

The electrons in the atoms of four elements A,B,C and D are distributed in three shells having 1,3,5 and 7 electrons respectively in their outermost shells. Write the group numbers in which these elements are placed in the Modern Periodic Table. Write the electronic configuration of the atoms of B and D and the molecular formula of the compound formed when B and D combine. 

Answer»
ElementNo. of ValenceElectronic configurationGroup No.
A12, 8, 11
B32, 8, 313
C52, 8 , 515
D72, 8, 717

Molecular formula of compound formed by B and D will be BD3



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