Question

Arrange the elements according to first ionization energy Highest ionization energy Lowest ionization energy Answer Bank s Teo Se

Answer 1

Trend of ionization energy:

The first ionization energy decreases as we go from top to bottom in the column of a periodic table

Reason: as we move from top to bottom in a column in a periodic table, atomic size of an element increases due to which the valence electrons moves farther away from the nucleus and thus the attraction of the nucleus on the valence electron decreases thereby making it easy to remove the electron and hence the ionization energy decreases.

oxygen (O) is first in the column followed by sulphur (S) , then selenium (Se) and lastly tellurium (Te)

therefore, O > S > Se > Te (highest ionization energy to lowest ionization energy)