Question

The energy of different orbitals in an atom or ion having only one electron depends on

• A. $n$ only
• B. $n$ and $l$ only
• C. $n$, $l$ and $m$ only
• D. $n$, $l$, $m$, $s$

Answer 1

The correct option is A $n$ only

$n$ is principal quantum number
$l$ is azimuthal quantum number

For single electron system, energy depends only on principal quantum number. For multi electron systems all electrons having same value of n do not have the same energy and it depends on $n$ and $l$ since each orbital has different energy