Chemical Bonding
NIOS · Class 10 · Science & Tech
All formulas from Chemical Bonding in NIOS Class 10 Science & Tech. Key equations, constants, and identities for board exam preparation.
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Ionic bonding
Formation of NaCl: 2Na(s) + Cl2(g) → 2NaCl(s)
Na+(g) + Cl-(g) → Na+Cl- or NaCl(s)
Mg → Mg2+ + 2e-
2Cl(g) + 2e- → 2Cl-(g)
Net energy difference for NaCl formation = 496 - 349 = 147 kJ/mol
Covalent bonding
H· + ·H → H:H → H2
:Cl· + ·Cl: → :Cl:Cl: (Cl-Cl)
O=O
:N≡N:
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