Per NCERT §4.8 (He₂), why does He₂ molecule NOT exist as a stable species?
AHe has no valence electrons
BHe nuclei are too heavy
CConfiguration (σ1s)²(σ*1s)² gives bond order = ½(2−2) = 0 → no net bonding
DRepulsion is too strong gravitationally
Answer & Solution
Correct answer: C. Configuration (σ1s)²(σ*1s)² gives bond order = ½(2−2) = 0 → no net bonding
Per NCERT §4.8(2), He₂: b.o. = 0 → no bonding → does not exist. Same logic shows Be₂ does not exist (b.o. 0).
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