Question

1
(A) Amorphous
(B) Crystalline
(C) both (a) and (b
(D) none of these
(b) 112
(C) is unstable
(D) none of these
21. The main defect of Bohr atom model is
(A) mixing of classical and quantum theories
(B) exclusion of nuclear motion
(C) failure to explain the fine structure of spectra
(D) none of these​

Answer 1

Answer:

21.) d none of these

Explanation:

Bohr's model can only clearly explain hydrogen or hydrogen-like atoms, it fails when applied to larger and heavier atoms like iron, gold, mercury, etc.