Arrange $s, p, d,$ and $f$ subshells of a shell in the increasing order of effective nuclear charge $(Z_{eff})$ experienced by the electron present in them.

For the valence shell of $Na$,screening is provided by:

How does the orbital energy change as the nuclear charge increases from $Ne$ to $Ca$?

The bromine atom possesses $35$ electrons. It contains $6$ electrons in $2p$ orbital,$6$ electrons in $3p$ orbital and $5$ electrons in $4p$ orbital. Which of these electrons experiences the lowest effective nuclear charge?

The screening effect of inner electrons of the nucleus causes

For which of the following is $Z_{eff}$ equal to $Z$?