Question

why shells are also known as stationery energy levels......?​

Answer 1

Bohr's orbits are called as stationary states because as we know that if an object moves in circular path it will lose energy but, according to bohr electrons which is moving in the circular path does not lose energy. if electrons lose energy they will fall into nucleus and get burnt.

mark ❤️

Answer 2

$\mathfrak \blue {answer}$

There are different energy levels in an atom where the electron revolves and these energy levels are called orbitals.

These orbitals are also called stationary orbitals.

because these orbits doesn't move anywhere but stay at their own position to maintain its constant energy