1.why is ionization enthalpy always (+)ve? 2.what is shielding effect ?What is slaters rule? 3.why do inert gases have large atomic radius? 4.calculate the electronegativity of C :- E(h-h)=104.2kcal/mol , E(c-c)=83.1kcal/mol , E(h-c)=98.8kcal/mol

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E_{H - H} = 104.2 k c a l

{m o l}^{- 1}

E_{F - F} = 36.6 k c a l

{m o l}^{- 1}

E_{H - F} = 134.6 k c a l

{m o l}^{- 1}

X_{H} = 2.1

E_{H - H} = 104.2 k c a l m o l^{- 1}

E_{C - C} = 83.1 k c a l m o l^{- 1}

E_{C - H} = 98.8 k c a l m o l^{- l}

X_{H} = 2.1.

E_{H - H} = 104.2 k c a l m o l^{- 1}

E_{F - F} = 36.6 k c a l m o l^{- 1}

E_{H - F} = 134.6 k c a l m o l^{- l}

X_{H} = 2.1.

E_{C - C} = 348 {kJ mol}^{- 1}, E_{C - H} = 412 {kJ mol}^{- 1} and E_{H - H} = 436 {kJ mol}^{- 1}

C

H

C_{2} H_{4} (g) + H_{2} (g) ⟶ C_{2} H_{6} (g)

Bond	$C - C$	$C = C$	$C - H$	$H - H$
Bond Enthalpy	$336.81 k J / m o l$	$606.68 k J / m o l$	$410.87 k J / m o l$	$431.79 k J / m o l$

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