Ionsation

Question 1

What is it

Answer 1

energy required to remove an electron From an atom or ion.

Question 2

down a group ionisation energy decreases
why?

Answer 2

down. group te atomic radius increases. hence electrons are further away from the nucleus. the electrostatic force of attraction is weaker tense less energy is required to remove an atom.

Question 3

across a group ionisation energy increases
why?

Answer 3

across a period due to the decreases in the atomic radius as well as the increase in the number of protons( atomic no.) this results is a greater electrostatic force of attrition hence more energy is required to remove an electron