What do the processes $(i) X_{(g)} \to X^+_{(g)} + e^-$ and $(ii) X^+_{(g)} \to X^{2+}_{(g)} + e^-$ represent?

  • A
    First and second electron gain enthalpy
  • B
    First and second ionisation enthalpy
  • C
    First and second electronegativity
  • D
    First and second atomic radius

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Why does the successive ionization enthalpy of an element increase in the order: $1^{st} < 2^{nd} < 3^{rd}$?

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The ionization energy of an element is defined as:

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