First slide

Classical atomic models

Question

The ionization energy of H is 13.6 electron volts (eV). The first and second ionization energies of He must be approximately.

Moderate

A

5 eV and 14 eV
B

5 eV and 54 eV
C

14 eV and 34 eV
D

24 eV and 54 eV

Solution

${IP}_{1}$ value of the He should be more than H. So $I_{1}$ of He should be 24 eV. Then 2nd IP of He should be 54 eV.

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