Question

give reasons: IP of elements increases across a period​

Answer 1

Answer:

General increase across the period

there are more protons in each nucleus so the nuclear charge in each element increases … therefore the force of attraction between the nucleus and outer electron is increased, and … ... so more energy is needed to remove the outer electron.

Answer 2

As we go down the group the IP decreases as atomic radii increases but moving from left to right along the period the IP increase as the radius of the nuclei increases and along with it the electron affinity increase.