Periodic Table of Elements #1-20: (Basic)

Hydrogen

Symbol: H

Atomic Number: 1

Helium

Symbol: He

Atomic Number: 2

Lithium

Symbol: Li

Atomic Number: 3

Beryllium

Symbol: Be

Atomic Number: 4

Boron

Symbol: B

Atomic Number: 5

Carbon

Symbol: C

Atomic Number: 6

Nitrogen

Symbol: N

Atomic Number: 7

Oxygen

Symbol: O

Atomic Number: 8

Fluorine

Symbol: F

Atomic Number: 9

Neon

Symbol: Ne

Atomic Number: 10

Sodium

Symbol: Na

Atomic Number: 11

Magnesium

Symbol: Mg

Atomic Number: 12

Aluminum

Symbol: Al

Atomic Number: 13

Silicon

Symbol: Si

Atomic Number: 14

Phosphorus

Symbol: P

Atomic Number: 15

Sulfur

Symbol: S

Atomic Number: 16

Chlorine

Symbol: Cl

Atomic Number: 17

Argon

Symbol: Ar

Atomic Number: 18

Potassium

Symbol: K

Atomic Number: 19

Calcium

Symbol: Ca

Atomic Number: 20