How many quantum numbers are required to define the electron in atom?

How many quantum numbers are required to fully specify an electron in an atom?

The number of magnetic quantum numbers required to describe the electrons of 'd'-subshell is______.

How many quantum number are required to identify an orbital? Explain it with the help of specific example.

How many and which quantum numbers are required to completely define : (i) an orbital and (ii) an electron in an atom?