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Q.

What is the trend of ionisation enthalpy across the period?

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a

decreases

b

remains the same

c

increases first and then decrease

d

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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