First ionisation Energy

Question 1

First Ionisation energy

Answer 1

First Ionisation Energy:
The process of removing an electron from an atom and forming an ion is known as
ionisation.
ionisation energy increases moving to the right of the periodic table.
Ionisation energy decreases moving down the periodic table.
It decreases moving down a group as the numbers of shells increases, therefore
the valence electrons are less attracted to the nucleus as they are further away. As
a result, the energy required to overcome the attraction between the nucleus and
the valence electron is less and the first ionisation energy deceases down a group.
It increases moving left to right across the table as the effective nuclear
charge increases, therefore the valence electrans become more strongly attracted to
the nucleus, and more energy is required to remove an electron.