Hydrogen atom does not emit X-rays because

Options

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

Answer

C

Explanation

X - rays are emitted from an electron is ionised in a level and electrons from higher filled shells make transition to this hole . As H atom has a single electron, it cannot emit X rays . The phenomenon of production decids whether the emitted radiation is X - ray and not just the energy region .