What is the trend of ionisation enthalpy across the period?

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decreases

remains the same

increases first and then decrease

increases

answer is A.

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Detailed Solution

The ionisation enthalpy is the energy required to remove an electron from an atom or ion.
As we move left to the right in a period in the periodic table, the nuclear charge of the atom increases.
The greater the nuclear charge of an atom greater will be the attraction for the electrons of the outermost shell.
Therefore the electrons in the outermost shell are more firmly held and greater energy is required to remove the electrons.
Thus, ionization energy increases from left to right in the period.

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