if energy order of moleculer orbitals is σ1s<σ*1s<σ2s<σ*2s determine no of bonds in

1}Be₂

2}Li₂

3}B₂²⁺

KINDIY EXPLAIN ME THIS WITH CLEAR EXPLANATION EVEN FIG ALSO

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane