Question

The average distance of electron from nucleus for the orbitals belonging to the 4th orbit is minimum for

Answer 1

2s (and 3s, 4s, etc) electrons spend some of their time closer to the nucleus than you might expect. The effect of this is to slightly reduce the energy of electrons in s orbitals. The nearer the nucleus the electrons get, the lower their energy. 3s, 4s (etc) orbitals get progressively further from the nucleus.

Answer 2

Answer:

The average distance and the most probable distance of an electron from the nucleus in the 1s orbital of a hydrogen atom are equal to 0.794A˚ and 0.529A˚

Explanation:

• The most probable distance is the distance where the electron is highest probable so it is the radius of that orbit and the average distance is the expectation value of the distance of an electron from the nucleus.
• The average distance and the most probable distance of an electron from the nucleus in the 1s orbital of a hydrogen atom are equal to 1.5a0 and a0.
• The value of a0 is 0.529 A˚.
• Hence, the average distance and the most probable distance of an electron from the nucleus in the 1s orbital of a hydrogen atom are equal to 0.794A˚ and 0.529A˚ respectively.