Question

Ionisation energy expressed in​

Answer 1

Answer:

Step-by-step explanation:

In physics, the ionization energy is measured in electron volts (eV) and measures how much energy is needed to remove one electron from one atom or molecule. In chemistry, the ionization energy is measured per mole of atoms or molecules and is expressed in kiloJoules per mole (kJ/mol).

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Answer 2

Answer:

because automatic size decrease in direction