Question

If v1, v2, v3 and v4 are velocities of the electron present in the first orbit of H, He+, Li+2 and Be+3, then which of the following should be their increasing order? (a) v1 v3 > v2 > v1 (c) v1 v4 (d) v1 > v2 v4

Answer 1

Answer:

V of H

2

⊕

=

nh

2πZe

2

or V α

n

Z

∴ V H

2

⊕

α 1 (Z = 1, n = 1)

V of Li

2+

α

3

3

α 1 (Z = 3, n = 3)

Therefore, velocity of e

−

in the third orbit of Li

2+

is the same velocity of an e

−

in the first orbit of H atom