Atomic Structure (1-20)

Offline !

close

Back Online

close

Atomic Structure of Elements (1-20)

Name (Symbol)

Atomic Number

Atomic Mass (Approx.)

Electronic Configaration

Stable Isotopes

Periodic Table open_in_new

Hydrogen (H)

Atomic Number = 1

Atomic Mass = 1

E.C : 1

¹H₁ ²H₁ ³H₁

Hydrogen

Helium (He)

Atomic Number = 2

Atomic Mass = 4

E.C : 2

--:--

Helium

Lithium (Li)

Atomic Number = 3

Atomic Mass = 7

E.C : 2, 1

--:--

Lithium

Beryllium (Be)

Atomic Number = 4

Atomic Mass = 9

E.C : 2, 2

--:--

Beryllium

Boron (B)

Atomic Number = 5

Atomic Mass = 11

E.C : 2, 3

--:--

Boron

Carbon (C)

Atomic Number = 6

Atomic Mass = 12

E.C : 2, 4

¹²C₆ ¹⁴C₆

Carbon

Nitrogen (N)

Atomic Number = 7

Atomic Mass = 14

E.C : 2, 5

--:--

Nitrogen

Oxygen (O)

Atomic Number = 8

Atomic Mass = 16

E.C : 2, 6

¹⁶O₈ ¹⁷O₈ ¹⁸O₈

Oxygen

Fluorine (F)

Atomic Number = 9

Atomic Mass = 19

E.C : 2, 7

--:--

Fluorine

Neon (Ne)

Atomic Number = 10

Atomic Mass = 20

E.C : 2, 8

--:--

Neon

Sodium (Na)

Atomic Number = 11

Atomic Mass = 23

E.C : 2, 8, 1

--:--

Sodium

Magnesium (Mg)

Atomic Number = 12

Atomic Mass = 24

E.C : 2, 8, 2

--:--

Magnesium

Aluminium (Al)

Atomic Number = 13

Atomic Mass = 27

E.C : 2, 8, 3

--:--

Aluminium

Silicon (Si)

Atomic Number = 14

Atomic Mass = 28

E.C : 2, 8, 4

--:--

Silicon

Phosphorus (P)

Atomic Number = 15

Atomic Mass = 31

E.C : 2, 8, 5

--:--

Phosphorus

Sulphur (S)

Atomic Number = 16

Atomic Mass = 32

E.C : 2, 8, 6

--:--

Sulphur

Chlorine (Cl)

Atomic Number = 17

Atomic Mass = 35.5

E.C : 2, 8, 7

³⁵Cl₁₇ ³⁷Cl₁₇

Chlorine

Argon (Ar)

Atomic Number = 18

Atomic Mass = 40

E.C : 2, 8, 8

--:--

Argon

Potassium (K)

Atomic Number = 19

Atomic Mass = 39

E.C : 2, 8, 8, 1

--:--

Potassium

Calcium (Ca)

Atomic Number = 20

Atomic Mass = 40

E.C : 2, 8, 8, 2

--:--

Calcium

Periodic Table of Elements open_in_new