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29 electrons are removed from Zn-atom (Z...

29 electrons are removed from Zn-atom (Z=30)by certain means. The minimum energy needed to remove the 30th electron, will be

A

12.24keV

B

408keV

C

0.45keV

D

765keV

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The correct Answer is:
A
After removing 29 electrons, Zn atom will become `Zn^(+29) therefore E=13.6Z^(2) e V =12,240 e V = 12.24KeV`
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