1.

Given electronic configurations of four elements E_1, E_2, E_3and E_4 are respectively 1s^2, 1s^2 2s^22p^1, 1s^22s^22p^5and 1s^22s^22p^6. The element which is capable of forming ionic as well as covalent bonds is

Answer»

`E_(1)`
`E_(2)`
`E_(3)`
`E_(4)`

ANSWER :C


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