SATHEE: Atomic Structure - Result Question 72

Atomic Structure - Result Question 72

####48. Statement I The first ionisation energy of Be is greater than that of B.

Statement II $2 p$ -orbital is lower in energy than $2 s$ .

(2000)

Passage Based Questions

The hydrogen-like species $L i^{2 +}$ is in a spherically symmetric state $S_{1}$ with one radial node. Upon absorbing light the ion undergoes transition to a state $S_{2}$ . The state $S_{2}$ has one radial node and its energy is equal to the ground state energy of the hydrogen atom.

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Answer:

Correct Answer: 48. (b,d)

Solution:

Assertion is correct $Be (1 s^{2}, 2 s^{2})$ has stable electronic configuration, removing an electron require more energy than the same for $B (2 p^{1})$ . Reason is incorrect (Aufbau principle).

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Atomic Structure - Result Question 72

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