Question

(a) The probability of finding electron is maximum at certain places in space.
(b) Energy change takes place only during excitation or de-excitation of electrons.
(c) An electron has both particle and wave nature.
(d) The angular momentum of the electrons revolving in different elliptical orbits is quantised.
Arrange the above statements of different models or principles in the chronological order, which ultimately led to the development of modern structure of atom.

• A. a b c d
• B. b d c a
• C. d c b a
• D. b c a d

Answer 1

The correct option is B b d c a

(a).Shrondiger's model (b)Bohr's model

(c)de-Broglie concept (d) Bohr's model

Out of (b) and (d), (b) Option is chronologically ahead of (d). Thus correct order is b d c a is option B.