Question

Hydrogen atom does not emit X-rays because -

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

Answer 1

The correct option is C energy level in it are very close to each other.

X-rays are high energetic radiations.

In hydrogen, energy levels are very close to each other, therefore the transition has not enough energy to generate X-rays.

Hence, option $\left(C\right)$ is the correct answer.