Question

The first ionization energy of lithium will be.
A) Greater than $ {{B}_{e}} $
B) Less than $ {{B}_{e}} $
C) Equal to that of $ {{N}_{a}} $
D) Equal to that of $ F $

Answer 1

Hint: Ionization Energy - The minimum amount of energy which is required by an element to lose an electron from its out a most shell or valence shell. As we move down the group Ionization Energy increases. Whereas if we move from left to right Ionization Energy increases.

Complete Step By Step Solution
Atomic no of lithium $ 'Z'=3 $
Electronic Configuration =
Of $ li $
i.e only $ {{e}^{-}} $ present in the outermost shell to remove one $ {{e}^{-}} $ small amount of energy is required.
As we move from left to right due to an increase in effective nuclear charge, Ionization Energy also increases.
Lithium required less first ionization energy than the $ {{B}_{e}} $
Option B is Correct.

Note
The knowledge of various properties related to trends in periodic table must be clear l;ike, Atomic radii, effective nuclear clear, Ionization Energy, Electron affinity, Ionic radius etc. If the effective nuclear charge increases then Ionization Energy increases vicenza . Effective nuclear charge refers to net positive charge experience by on an electron in an atom.