JEE Main · 2019 · 09 Jan 2019 · Shift 1 · Classification of Elements and Periodicity

In general, the properties that decrease and increase down a group in the periodic table respectively are

(A)atomic radius and electronegativity
(B)electron gain enthalpy and electronegativity
(C)electronegativity and atomic radius enthalpy✓ Correct
(D)electronegativity and electron gain

Answer: (C)

Solution

Going down a group, each new period adds a shell, so the atomic radius grows and the nucleus holds the outermost electrons more loosely. That same loosening means the atom draws bonding electrons less strongly, so electronegativity falls. Hence electronegativity decreases while atomic radius increases down a group.

JEE Main · 2019 · 09 Jan 2019 · Shift 1 · Single correct option

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