Olympiad workbook

Exam: Olympiad workbook
Subject: NSEC
Chapter: Classification of Elements and Periodicity in Properties

Olympiad workbook · NSEC · Classification of Elements and Periodicity in Properties

The energy required to remove an electron from a gaseous species '...

The energy required to remove an electron from a gaseous species ' X ' to form ' X '. is known as first ionization energy (IE) of X . The energy required to remove an electron from a gaseous species '

\mathrm{X}^{+}

' to form '

\mathrm{X}^{++}

' is called the second IE of X . Similarly, the energy required to remove an electron from a gaseous species

\mathrm{X}^{-}

to form X is called the IE of

\mathrm{X}^{-}

. Identify the correct statement/s from the following

Options

AThe second IE of the He atom is four times that of the (first) IE of the H atom.
BThe first IEs of F, Ne and Na atoms follow the order IE $(\mathrm{Na}) < \mathrm{IE}(\mathrm{Ne}) < \mathrm{IE}(\mathrm{F})$
CThe second IE of the $\mathrm{H}^{-}$ ion is much less than the (first) IE of the H atom.
DThe IEs of $\mathrm{Li}, \mathrm{Na}$ and K atoms follow the order $\mathrm{IE}(\mathrm{K}) < \mathrm{IE}(\mathrm{Na}) < \mathrm{IE}(\mathrm{Li})$

Correct answer

D. The IEs of $\mathrm{Li}, \mathrm{Na}$ and K atoms follow the order $\mathrm{IE}(\mathrm{K}) < \mathrm{IE}(\mathrm{Na}) < \mathrm{IE}(\mathrm{Li})$

Step-by-step solution

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