Q.

Given electronic configurations of four elements E1, E2, E3 and E4 are respectively 1s2, 1s2 2s2 2p2, 1s2 2s2 2p5 and 1s2 2s2 2p6. The element which is capable of forming ionic as well as covalent bonds is

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a

E1

b

E2

c

E3

d

E4

answer is C.

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Detailed Solution

Element, E3 is a halogen(Fluorine)Fluorine can form ionic bond with metalsFluorine foms a Covalent bond with non-metals
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Given electronic configurations of four elements E1, E2, E3 and E4 are respectively 1s2, 1s2 2s2 2p2, 1s2 2s2 2p5 and 1s2 2s2 2p6. The element which is capable of forming ionic as well as covalent bonds is