1.

The atomic number of four elements are given below. (The symbols ore not real) A – 8 B – 10 C – 12D – 18 a. Write the sub-shell electronic configuration of the elements, b. Which of them are inert gases? c. Write the chemical formula of the compound formed by two elements other than inert gases.

Answer»

a. A – 1s2 2s2 2p4

B – 1s2 2s2 2p6

C – 1s2 2s2 2p6 3s2 

D – 1s2 2s2 2p6 3s2 3p6 

b. B, D 

c. CA, (C2 A2 is simplified and written as CA)



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