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Question

Arrange the following elements in the decreasing order of their first ionisation energy.

A
Boron (B)
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B
Carbon (C)
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C
Beryllium (Be)
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D
Oxygen (O)
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Solution

These elements belong to the second period in the modern periodic table.
As we move from left to right across a period, atomic size decreases. This results in a greater pull on the electrons and therefore more energy is required to remove them.

The correct order of first ionisation energy would be:
O > C > B > Be

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