A maximum of 8 electrons can share the quantum number n = 2.
Principal Quantum number has a symbol of "n". It tells you the energy level on which an electron resides. You need to determine exactly how many orbitals you have in this energy level before you can determine the number of electrons that can share the value of n.
The number of orbitals you get per energy level can be found using this formula:no. of orbitals=n²Each orbital can hold a maximum of two electrons, the formula would be:no. of electrons=2n²Using the given formulas:no. of orbitals = n² = 2² = 4no. of electrons =2 * 4 = 8