Assertion: Ionisation potential across the period is `NaltAlltMgltSi`.
Reason : Ionisation potential decreases with decrease in atomic size.

Assertion (A): Ionisation potential across a period is Li lt B lt Be lt C Assertion (R): Ionisation potential decreases with decrease in atomic size

The ionisation potential of hydrogen atom is

The ionisation potential of hydrogen atom is

Highest ionisation potential in a period is shown by

Highest ionisation potential in a period is shown by

Highest ionisation potential in a period shown by

Give reason : Ionisation polential increases across a period-left to right.