Why is the first ionization energy lower than the third ionization energy

Expert Solution

The minimum energy is required to remove the most loosely bound electrons from isolated gaseous atom to convert it into a gaseous ion.

M(g) + I.E --------------> M^+ (g) + e^-

first ionisation energy:

The amount of energy is required to remove electron from gaseous atom is called first ionisation energy.

M (g) + I.E1 ----------------------> M^+ (g) + e^-

The amount of energy is required to remove electron from unipositive ion is called second ionisation energy.

M^+(g) + I.E2 ----------------> M^2+ (g) + e^-

The amount of energy is required to remove electron from bipositive ion is called third ionisation energy.

M^2+ (g) + I.E3 ----------------> M^3+ (g) + e^-

The removing an electron from an atom, the bipositive ion formed will have more effective nuclear charge than neutral atom and unipositive ion.So third ionisation energy is greater than first ionisation energy.

The first ionization energy lower than the third ionization energy

queen_honey_blossom answered 2 years ago

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