Question

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 shell. 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 1

Answer:The elements A, B, C, D belong 3rd period.

EC of A is 2,8,1

EC of D is 2,8,7

When A and D combine AD is the molecular formula.

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