The alkaline earth elements electron structure end in s2
1s22s22p6
[Ar]3d104s24p6
Sulfide, S2-
They all have the same electron configuration as the noble gas argon.
The family of 'noble' (= inert) gasses in group (column) 18 of the periodic table. Their valence shell is completely filled up with s2 and p6 electrons.
s2,s2 p6.s1
All elements in group 1 have 1 valence electron.
Group 13 (B, AL, Ga, In, Tl) all have (n)s2 (n)p1 configurations, in wch (n) has a value of 2, 3, 4, 5. Hence they have 3 valence electrons.
The elements in group 6a (16) have six valence electrons. The valence electron configuration is Xs2Xp4 , where X is the main energy level (period number).
1s22s22p6
[Ar]3d104s24p6
In the modern periodic table, these elements belong to group 17. These elements have s2 p5 electron configuration. Hence they need one more electron from an electron donor to fulfill its valence shell to obtain noble gas configuration.The elements in the group 7A has 7 electrons in their outermost energy level. They gain 1 electron to get the noble gas configuration. The elements in the group 7A are called halogens.
All alkaline earth metals have electron configurations ending in s2; 6s2 would be the alkaline earth metal in period 6 of the PTE, which is barium.
Sulfide, S2-
phosphorus has 15 protons and electrons: 1 s2 2 s2, 2 p6 3 s2, 3 p3 This adds up to a total of 15 electrons.
They have the same electron configuration as argon, which means they are isoelectronic with argon.
They all have the same electron configuration as the noble gas argon.