Period 2 of the Periodic Table

Period 2 of the periodic table has 8 elements, from Lithium (Li) to Neon (Ne). The period number usually equals the number of electron shells of the atom, and in this period the 2s and 2p subshells are filled. Moving left to right across a period, the atomic number increases and the atomic radius usually decreases.

Element list

Atomic no.	Symbol	Name	Atomic mass	Phase	Short configuration
3	Li	Lithium	6.94	Solid	[He] 2s¹
4	Be	Beryllium	9.0122	Solid	[He] 2s²
5	B	Boron	10.81	Solid	[He] 2s² 2p¹
6	C	Carbon	12.011	Solid	[He] 2s² 2p²
7	N	Nitrogen	14.007	Gas	[He] 2s² 2p³
8	O	Oxygen	15.999	Gas	[He] 2s² 2p⁴
9	F	Fluorine	18.998	Gas	[He] 2s² 2p⁵
10	Ne	Neon	20.18	Gas	[He] 2s² 2p⁶

Frequently asked questions

How many elements are in period 2 of the periodic table?

Period 2 of the periodic table has 8 elements.

Which elements are in period 2?

The elements of period 2 run from Lithium to Neon: Lithium (Li), Beryllium (Be), Boron (B), Carbon (C), Nitrogen (N), Oxygen (O), Fluorine (F) and Neon (Ne).