Physical Chemistry> how much energy is required to ionise a H...

how much energy is required to ionise a H atom if the electron occupies n=5 orbit? Compare your answer with ionization enthalpy of H atom

Rishi Manoj , 6 Years ago

Grade 11

1 Answers

Apurva Sharma

Last Activity: 6 Years ago

the ionisation energy of an atom $E= -2.18 * 10^{-18} Z^{2}/n^{2}$

so the energy required to ionise the atom when n=5

$E= -2.18 * 10^{-18} * 1^{2}/5^{2}$

$E= -8.72*10^{-20} J$ …....eq 1

now ionisation energy of H atom, i.e. n=1

$E= -2.18*10^{-18} * 1^{2}/1^{2}$

$E= -2.18*10^{-18}$ …...eq 2

on comparing both eq 1 and 2 we conclude that

eq2/eq1 :

$-2.18*10^{-18}/ -8.72*10^{-20} =25$

thus the enrgy required to remove electron from 1^storbit is 25 times the energy required to remove electron from 5^th orbit.

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Physical Chemistry> how much energy is required to ionise a H...

how much energy is required to ionise a H atom if the electron occupies n=5 orbit? Compare your answer with ionization enthalpy of H atom

Rishi Manoj , 6 Years ago

Apurva Sharma

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