4 is the number of electrons in that sublevel.
Gallium does. Atomic # 31
Electron Configuration: 1s2 2s2 2p4 Abbr: [He] 2s2 2p4
1s2 2s2 2p4
S- = 1s2 2s2 2p4
1s2 2s2 2p4
1s2 2s2 2p4
6 valence electrons 1s2 2s2 2p4 These 6 valence electrons are in the outer shell.
The electron configuration of oxygen (atomic number 8) is 1s2 2s2 2p4The noble gas form is [He] 2s22p41s2 2s2 2p4
Electron configuration for oxygen (O) is 1s2 2s2 2p4. The valency is 2-.
1s2 2s2 2p4
Oxide - O2- electronic configuration of oxygen atom: 1s2, 2s2 2p4. electronic configuration of oxygen ion: 1s2, 2s2 2p6. phosphate - PO43-
n is the principal quantum number and represents the energy level or electron shell in which an electron resides. For example - Say you have an Oxygen atom, which has 8 electrons. It's electron configuration is 1s2 2s2 2p4. The 2 in 2p4 is the principle quantum number, n. The s is another term dealing with angular momentum and the 4 is the number of electrons.