Periodic Classification and Periodic Properties - Result Question 8
####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:
- 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.
