In a given shell,the order of screening effect is

In which pair does the first element have a higher $Z_{eff}$ than the second atom?

If $Z_{eff}$ of boron is $x$,then $Z_{eff}$ of oxygen will be

The value of the screening constant for an electron in a $3s$ orbital is identical to that of an electron present in which of the following orbitals?

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

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?