Periodic Table: First 20 Elements

Hydrogen

Atomic Number: 1

Symbol: H

Atomic Mass: 1

Protons: 1

Neutrons: 0

Electrons: 1

Helium

Atomic Number: 2

Symbol: He

Atomic Mass: 4

Protons: 2

Neutrons: 2

Electrons: 2

Lithium

Atomic Number: 3

Symbol: Li

Atomic Mass: 7

Protons: 3

Neutrons: 4

Electrons: 3

Beryllium

Atomic Number: 4

Symbol: Be

Atomic Mass: 9

Protons: 4

Neutrons: 5

Electrons: 4

Boron

Atomic Number: 5

Symbol: B

Atomic Mass: 11

Protons: 5

Neutrons: 6

Electrons: 5

Carbon

Atomic Number: 6

Symbol: C

Atomic Mass: 12

Protons: 6

Neutrons: 6

Electrons: 6

Nitrogen

Atomic Number: 7

Symbol: N

Atomic Mass: 14

Protons: 7

Neutrons:7

Electrons: 7

Oxygen

Atomic Number: 8

Symbol: O

Atomic Mass: 16

Protons: 8

Neutrons: 8

Electrons: 8

Fluorine

Atomic Number: 9

Symbol: F

Atomic Mass: 19

Protons: 9

Neutrons: 10

Electrons: 9

Neon

Atomic Number: 10

Symbol: Ne

Atomic Mass: 20

Protons: 10

Neutrons: 10

Electrons: 10

Sodium

Atomic Number: 11

Symbol: Na

Atomic Mass: 23

Protons: 11

Neutrons: 12

Electrons: 11

Magnesium

Atomic Number: 12

Symbol: Mg

Atomic Mass: 24

Protons: 12

Neutrons: 12

Electrons: 12

Aluminum

Atomic Number: 13

Symbol: Al

Atomic Mass: 27

Protons: 13

Neutrons: 14

Electrons: 13

Silicon

Atomic Number: 14

Symbol: Si

Atomic Mass: 28

Protons: 14

Neutrons: 14

Electrons: 14

Phosphorus

Atomic Number: 15

Symbol: P

Atomic Mass: 31

Protons: 15

Neutrons: 16

Electrons: 15

Sulfur

Atomic Number: 16

Symbol: S

Atomic Mass: 32

Protons: 16

Neutrons: 16

Electrons: 16

Chlorine

Atomic Number: 17

Symbol: Cl

Atomic Mass: 35

Protons: 17

Neutrons: 18

Electrons: 17

Argon

Atomic Number: 18

Symbol: Ar

Atomic Mass: 40

Protons: 18

Neutrons: 22

Electrons: 18

Potassium

Atomic Number: 19

Symbol: K

Atomic Mass: 39

Protons: 19

Neutrons: 20

Electrons: 19

Calcium

Atomic Number: 20

Symbol: Ca

Atomic Mass: 40

Protons: 20

Neutrons: 20

Electrons: 20