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Q. Match Column-I with Column-II and select the correct answer by the given codes.
Column I (Atoms) Column II (Properties)
A $He$ p Highly electronegative
B $F$ q Most electropositive
C $Rb$ r Strongest reducing agent
D $Li$ s Highest ionisation energy

Classification of Elements and Periodicity in Properties

Solution:

Helium (He) $1 s^{2}$ $\rightarrow$ Highest ionisation energy due to noble gas in nature.
Fluorine(F) $1 s^{2}, 2 s^{2} 2 p^{3} \rightarrow$ High electronegativity in nature due to small size and -1 oxidation state.
Rubidium(Rb)$\rightarrow$ Most electropositive element due to large atomic size.
Lithium(Li)$\rightarrow $ Strongest reducingagent due to greaterhydration energy.