Question

If velocity of an electron in 1st orbit of H atom is V. what will be the velocity of 3rd orbit of Li+2
**
(A) V
(B) v/3
(C) 3 V
(D) 9V​

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

Answer 2

Answer:

If velocity of an electron in orbit of H atom is V, what will be the velocity of electron in 3rd orbit of Li+2 (A) V (B) V/3 (C) 3 V (D) 9 V B-7. The energy of electron in first Bohr's orbit of H-atom is -13.6 eV. What will be its potential energy in n = 4th orbit - (A) - 13.6 eV (B) -3.4 eV (C) -0.85 eV (D) -1.70 eV B-8. If the value of En = - 78.4 kcal/mole, the order of the orbit in hydrogen atom is : (A) 4 (B) 3 (C) 2 (D) 1 8. ATOMIC STRUCTURE # 7 ETOOS ACADEMY Pvt. Ltd F ...