Question

The periodic property which relates to the amount of energy required to remove an electron from the outermost shell of an isolated gaseous atom:
A) Electronegativity
B) ionization potential
C) atomic size
D) All of the above

Answer 1

Removal of electrons can be considered to be ionization. Energy required for the ionization is called the ionization potential. Ionization potential is different for different electrons according to their affinity and interaction with the nuclear charge.

Complete answer:
The ionization energy, or ionization potential, is the energy needed to totally eliminate an electron from a vaporous ion or atom. The nearer and all the more firmly bound an electron is to the core, the more troublesome it will be to eliminate, and the higher its ionization energy will be. The principal ionization energy is the energy needed to eliminate one electron from the parent ions. The second ionization energy is the energy needed to eliminate a second valence electron from the univalent particle to shape the divalent particle, etc. Progressive ionization energies increase. The second ionization energy is consistently more noteworthy than the primary ionization energy. Ionization energies increase from left to directly across a period (diminishing nuclear sweep). Ionization energy diminishes dropping down a gathering (expanding nuclear range). Gathering I components have low ionization energies in light of the fact that the deficiency of an electron shapes a steady octet.

Note:
Electronegativity is the tendency of atoms to attract the shared pair of electrons towards themselves. Atomic size is the radius of the atom which is defined as the distance between the centre of the nucleus and the outermost shell.