Neon is a noble gas with 10 electrons. Neon has 2 core electrons and 8 valence electrons. It does not share electrons with other elements to form bonds.
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The shorthand electron configuration of magnesium is [Ne]3s².
Phosphorus has 10 core electrons. It is in the 3rd period of the periodic table and has an atomic number of 15. The inner electron configuration for phosphorus is [Ne]3s^23p^3, where [Ne] represents the noble gas configuration of Neon.
The noble gas electron configuration of an aluminum ion (Al3+) is [Ne] because aluminum loses three electrons to form the Al3+ ion, which results in the same electron configuration as neon (Ne), a noble gas.
Bromine has 28 total electrons, with 18 being core electrons located in the inner electron shells.
The electron configuration of sulfur in the excited state is [Ne] 3s2 3p4, rather than the ground state configuration of [Ne] 3s2 3p4. In the excited state, an electron has moved from the 3p orbital to a higher energy level.