Periodic Table: First 20 Elements

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The First 20 Elements of the Periodic Table.

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

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