It is simply LI meaning 50+1 = 51
13
9
The Roman numeral LI means 50+1 = 51
8
2
The correct noble gas configuration for Li is neon (1s^2 2s^1).
Li plus
lithium+1
Plus 1. Li^+1
Fudge it!
The element with the electron configuration 1s2 2s1 is lithium.
[He]2S1
In Li plus 1, the element is lithium (Li) which has 3 protons. Since it has a +1 charge, it means it has lost one electron, so it has 2 electrons.
The electron configuration and noble gas core for Li+ is that of He: Li+: (1s2, 2s0)
Long-hand version: 1s^2 2s^1 Short-hand version: [He] 2s^1 Note: The "^" symbol means the the following number is in the form of a superscript.
Li, Be, O: the first term in the abridged electron configuration is [He]. Ca, K: the first term in the abridged electron configuration is [Ar].