A period 2 element is one of the chemical elements in the second row (or period) of the periodic table of the elements.
These are:
Group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
#
Name3
Li4
Be
5
B6
C7
N8
O9
F10
Ne
e--conf.
Alkali metals Alkaline earths Lanthanide Actinides Transition metals Other metals Metalloids Nonmetals Halogens Noble gases