Question

26. Ionization energy contributes to an atom's chemical reactivity. Which of the following shows an accurate ranking of ionization energies from lowest to highest? . A. first ionization energy of Be < second ionization energy of Be < first ionization energy of Li B. first ionization energy of Be < first ionization energy of Li <second ionization energy of Be . C. first ionization energy of Li < first ionization energy of Be < second ionization energy of Be C D. first ionization energy of Li < second ionization energy of Be < first ionization energy of Be . im. Anae werk (13K) on the system and the

Answer 1

Ionization energy (I.E.) is the amount of energy required to remove the valence electrons from the gaseous atom.

Ionization energy is inversely related to the size of atom and also depends upon the stability of electronic configuration.

Out of Li and Be , size of Li is slightly larger and it has only one electron extra than noble gas configuration, so Li readily looses one electron to get stable configuration and hence first ionization energy of Li is lowest.

Then comes first ionization energy of Be and second ionization of Be is more than first because after first ionization there is positive charge over Be and this positive charge causes valence electron to be attracted more towards nucleus and thus more energy is required to remove second electron (that is why second ionization energy is more).

Thus correct order of ionization energy from lowest to highest is ;

Option (c) first ionization energy of Li < first ionization energy of Be < second ionization energy of Be .