Atoms - Result Question 46

48. The ionisation energy of hydrogen atom is $\mathbf{1 3 . 6}$ $eV$, the ionisation energy of helium atom would be

[1988]

(a) $13.6 eV$

(b) $27.2 eV$

(c) $6.8 eV$

(d) $54.4 eV$

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Answer:

Correct Answer: 48. (d)

Solution:

  1. (d) $E \propto Z^{2}$ and $Z$ for helium $=2$

$\therefore(E) _{He}=4 \times 13.6=54.4 eV$



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