Question

what os ionisation energy?How do they change in groups and periods​

Answer 1

Answer:

In chemistry terms, given the same number of energy levels, the more protons an atom has, the higher its ionization energy will be, so as you move across a period on the periodic table, the ionization energy increases. ... Ionization energy decreases when moving down groups; it increases across periods.

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Answer 2

Answer:

it is the minimum amount of energy required to remove the most loosely bound electron of an isolated neutral gaseous molecule

down a group ionization energy decrease

period from left to right ionization energy will increase..