It goes by valence electrons. The configuration of Sulfur is: 1s2 2s2 2p6 3s2 3p4. Sulfur has 6 valence the electrons in the 3s and 3p oribitals. So the principal quantum number, which is denoted by n, is equal to 3. Thus n=3 is for sulfur.
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The principal quantum number of sulfur is 3. It represents the main energy level or shell in which the electron is found in a sulfur atom.
n = 2
The quantum numbers of calcium are: Principal quantum number (n): 4 Angular quantum number (l): 0 Magnetic quantum number (ml): 0 Spin quantum number (ms): +1/2
The principal quantum number for the outermost electrons in a bromine atom in the ground state is 4. This corresponds to the fourth energy level or shell in the atom, where the outermost electrons are located.
In Niels Bohr's atomic model, he labeled a quantum number to describe the energy levels of electrons orbiting the nucleus. He called this quantum number "n," which represents the principal quantum number and determines the energy and size of the electron's orbit.
The four quantum numbers of arsenic are: Principal quantum number (n): 4 Azimuthal quantum number (l): 3 Magnetic quantum number (ml): -3 to +3 Spin quantum number (ms): +1/2 or -1/2