# Question #fbf09

The $4 d$ subshell can hold a maximum of $5$ orbitals or $10$ electrons. Any given $4 d$ orbital can hold a maximum of $2$ electrons though.
Since $1$ orbital can hold a maximum of $2$ electrons, and there are $5$ orbitals in the $4 d$ subshell, it can be concluded that there are a maximum of $10$ electrons allowed. Coming back to your question, any given $4 d$ orbital can hold a maximum of $2$ electrons.