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How many of the elements given below use...

How many of the elements given below use their atomic orbitals in their excited state for hybridisation forming their stable compounds with hydrogen. Coordination number of central atom is less than or equal to 4.
`C,Si,N,O,P,Be`

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The correct Answer is:
3
`CH_(3)rarr("1st E.S."), SiH_(4)rarr"(1st E.S.)",`
`NH_(3)rarr(G.S.),H_(2)Orarr(G.S.),PH_(3)rarr(G.S.)`
`BeH_(2)rarr` (1st E.S.)
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