Question

Na, Mg, and Al are the elements of the 3rd period of the Modern Periodic Table having group number 1, 2 and 13 respectively. Which one of these elements has the (a) highest valency, (b) largest atomic radius, and (c) maximum chemical reactivity? Justify your answer stating the reason for each.(All India - 2017)

Answer 1

Answer:

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Explanation:

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Answer 2

a) Al has the highest valency

b) Na has the largest radius

c) Na has the maximum reactivity

a) Aluminum belongs to the IIIA group (group 14) of the periodic table and thus has +3 as the highest valency.

Na (group 1) has +1 as it's highest valency and Mg (group 2) has +2 as it's highest valency.

b) The atomic radius decreases as we go from left to right across a period. The elements Na, Mg and Al all lie in the same period . Na being on left to both Mg and Al has the largest radius .

c) The chemical reactivity of metals decreases as we go from left to right across a period. Thus , Na has the maximum reactivity.