Question

The correct order of decreasing first ionization energy is of silicon mechanism aluminium and sodium

Answer 1

Answer:

Dear Student,

Actually there are 8 elements in 2nd period.

# Ionisation energy -

It is the minimum amount of energy required to remove the valence electron of an isolated neutral gaseous atom or molecule.

Usually ionization enthalpy increases from left to right in period.

◆ Answer -

Decreasing order of 1st ionization enthalpies of elements of second period is -

Ne > F > N > O > C > Be > B > Li

● Explanation -

For 2nd group elements, variation in trend of ionization enthalpy is attributed to -

Be is more stable than B due to its filled s-orbital.

N is more stable than O due to its half-filled p-orbital.

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