Question

Hydrogen atom does not emit $X-rays$ because

• A. it contains only a single electron
• B. energy levels in it are far apart
• C. its size is very small
• D. energy levels in it are very close to each other

Answer 1

Answer: (D)

energy levels in it are very close to each other

Answer 2

Hydrogen atom does not emit $X$ -rays because its energy levels are too close to each other.