Question

For which one of the following, Bohr model is not valid?

• A. Hydrogen atom
• B. Singly ionised helium atom $(He^+)$
• C. Deuteron atom
• D. Singly ionised neon atom $(Ne^+)$

Answer 1

Answer: (D)

Singly ionised neon atom $(Ne^+)$

Answer 2

Bohr model is applicable for only single electron species. Singly ionised neon atom has more than one electron in orbit. Hence, Bohr model is not valid