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Nuclear Radius

Arrange the f...

Question

Arrange the following atoms in increasing order of density: $N a, A l, F e, P b$

P b > F e > A l > N a

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F e > P b > A l > N a

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A l > F e > P b > N a

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A l > P b > F e > N a

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Solution

The correct option is A $P b > F e > A l > N a$
The increasing order of density is Na < Al < Fe < Pb. The atomic mass of Al (27) is higher than the atomic mass of Na (23). The atomic volume of Na is higher than the atomic volume of Al (as the effective nuclear charge of Al is higher than the effective nuclear charge of Na). Hence, the density of Al is higher than the density of Na.

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