Multiple choice

What affects the ionisation energy of an element?

Ionisation energy of an atom or molecule describes the minimum amount of energy required to remove an electron from the atom or molecule in the gaseous state.

X   +  energy---->  X+ + e-

  1. Atomic size

  2. Electron affinity

  3. Electronegativity

  4. Neutron

  5. Proton
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A Correct answer
Explanation

In small atoms, electrons remains close to the  nucleus and they have more nuclear attraction, so more energy is required to remove electrons from small atoms. In small atoms, electrons remains close to the nucleus and they have more nuclear attraction, so more energy is required to remove electrons from small atoms.

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