Question

what is ionization energy and can you give an example of it? relate atomic size to ionization energy.

Answer 1

the energy required to remove one electron from each atom in one mole of gaseous atoms of an element to form one mole of gaseous 1+ ions.

e.g. Na(g) --------> Na^+(g) + e^-

first ionization energy = +496 KJmol^-1

Answer 2

The necessary energy that we must contribute to a neutral atom in the gas phase to release an electron. The plucked electron will be the outermost and will require less energy since it is far from the nucleus.

Step-by-step explanation:

The ionization energy increases in the periods of the periodic table and decreases in the groups. If the atom is very small, we will need a lot of energy to release the electron, while if the atom is larger the energy will be greater.