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Question

Which electron removal from the valence shell of a carbon atom requires the highest energy?

A
1st electron
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B
2nd electron
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C
3rd electron
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D
4th electron
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Solution

The correct option is D 4th electron
After removing the 1st electron, the energy required to remove the 2nd electron from its orbit is higher than that of the 1st electron.
This is because 6 protons now attract 5 electrons and they exert more force on them compared to the previous case.

Similarly, energy to remove the 4th electron >>> energy to remove the 3rd electron >> energy to remove the 2nd electron.

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