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Which of the following graphs show electron probability density of 2s?

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a

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b

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c

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d

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answer is D.

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Detailed Solution

The graphs drawn between $ψ^{2}$ and $r$ are known as radial probability distribution curves.
Radial nodes for 2s orbital = n - l - 1 = 2 - 0 - 1 = 1( $∵$ n = 2 & l = 0).
Hence, fourth option represents electron probability density of 2s electron where, the probability density first decreases sharply to zero and again starts increasing.

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