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The electroin arrangements of four eleme...

The electroin arrangements of four elements are given below :
A 2,8,7 B 2,8,18,8
C 2,8,1 D 2,8,6
(i) Name the type of bond formed when A combines with C.
(ii) Which of the four elements is an inert gas ?
(iii) Write the formula of the compound formed between C and D.

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