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The Atomic Numbers of the Elements Na, Mg, K and Ca Are 11, 12, 19 and 20 Respectively. the Element Having the Largest Atomic Radius Is: (A) Mg (B) Na (C) K (D) Ca - CBSE Class 10 - Science

ConceptPosition of Elements and Trends in the Modern Periodic Table

Question

The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element having the largest atomic radius is:

(a) Mg
(b) Na
(c) K
(d) Ca

Solution

K.
Potassium (K) with an atomic number of 19 has the largest atomic radius. This is because sodium and potassium are elements of group 1. On moving from top to bottom in a group, the atomic radius increases. Magnesium and calcium are elements of group 2. The size of the atomic radius decreases on moving from left to right in a period of the periodic table .

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Lakhmir Singh Solution for Chemistry for Class 10 (2019 Exam) (2018 to Current)
Chapter 5: Periodic Classification Of Elements
Q: 49 | Page no. 306

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Solution The Atomic Numbers of the Elements Na, Mg, K and Ca Are 11, 12, 19 and 20 Respectively. the Element Having the Largest Atomic Radius Is: (A) Mg (B) Na (C) K (D) Ca Concept: Position of Elements and Trends in the Modern Periodic Table.
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