Nonmetals of the Periodic Table

The nonmetals are usually poor conductors of heat and electricity and are brittle in solid form; they are the base elements of organic and biological chemistry. There are 7 elements of this category in the periodic table, from Hydrogen (H), atomic number 1, to Selenium (Se), atomic number 34.

Nonmetals at a glance

Number of elements: 7
Phase under standard conditions: Solid 4 elements; Gas 3 elements

Element list

Atomic no.	Symbol	Name	Atomic mass	Phase	Short configuration
1	H	Hydrogen	1.008	Gas	1s¹
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
15	P	Phosphorus	30.974	Solid	[Ne] 3s² 3p³
16	S	Sulfur	32.06	Solid	[Ne] 3s² 3p⁴
34	Se	Selenium	78.96	Solid	[Ar] 3d¹⁰ 4s² 4p⁴

Frequently asked questions

Which elements are the nonmetals?

The nonmetals are Hydrogen, Carbon, Nitrogen, Oxygen, Phosphorus, Sulfur and Selenium.

How many elements are in the nonmetals category?

The periodic table has 7 elements in the nonmetals category.