Assertion: Ionisation potential of `Be` (atomic no.4) is less than `B` (atomic no.5).
Reason: The first electron released from `Be` is of p-orbital but that from `B` is of s-orbital.

Assertion (A) : Ionisation potential of Be (atomic number 4 ) is more than B (atomic number 5) Reason (R ) : The first electron released fromm Be is of p orbitals but that from B is of s orbitals.

Assertion (A) : Ionisation potential of Be (atomic number 4 ) is than B (atomic number 5) Reason (R ) : The first electron released fromm Be is of p orbitals but that from B is of a orbitals.

Ionisation potential of Is electron is ... than that of 2s electron in the same atom.

First ionisation potential of C- atom is greater than that of B atom , where as the revers is true is for second ionisation potential.

The ionisation potential of H - atom is 13.6eV .The energy required to remove an electron from the second orbit of hydrogen is

Assertion: The first ionisation energy of Be is greater than that of B . Reason: 2p-orbital is lower in energy than 2s-orbital.

Assertion: The first ionisation energy of Be is greater than that of B . Reason: 2p-orbital is lower in energy than 2s-orbital.

Assertion: The first ionisation energy of Be is greater than that of B . Reason: 2p-orbital is lower in energy than 2s-orbital.