Question

Velocity of electron and energy of an atom as electrons move from lower orbits to higher orbits.

• A. increases
• B. decreases
• C. remains zero
• D. remains constant

Answer 1

Answer: (A), (B)

decreases

From Bohr's model we know that
$v=\left(\frac{e^2}{2\pi {ϵ}_0}\right)\frac{1}{n}$
So velocity will decrease as electrons reach in higher orbits.
Similarly E = - ($\frac{13.6}{n^2}$) ev
The energy of an atom is the least (largest negative value) when its electron is revolving in an orbit closest to the nucleus i.e., the one for which n = 1. For n = 2, 3, ... the absolute value of the energy E is smaller, hence the energy is progressively larger in the outer orbits