Periodic Classification and Periodic Properties 2 Question 5

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

(2019 Main, 9 Jan I)

(a) electronegativity and atomic radius

(b) electronegativity and electron gain enthalpy

(c) electron gain enthalpy and electronegativity

(d) atomic radius and electronegativity

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Answer:

Correct Answer: 5. (a)

Solution:

  1. The summary of variation of periodic properties is given in table below:
S.No. Periodic property Variation
Along a period Along a group
1. Atomic radius Decreases Increases
2. Electron gain
enthalpy
Increases Decreases
3. Electronegativity Increases Decreases

Thus, electronegativity decreases and atomic radius increases down a group in the periodic table.