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Period 3 elements

Period 3 covers eight elements from sodium to argon. It mirrors period 2 in structure but with a third electron shell, and includes industrially crucial elements like aluminium, silicon, phosphorus and sulfur.

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Category: All elements Nonmetals Noble gases Alkali metals Alkaline earth metals Metalloids Post-transition metals Transition metals Lanthanides Actinides
Period: 1 2 3 4 5 6 7
Group: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Block: S P D F
Phase: Solid Liquid Gas

List of chemical elements (8)

Cards Compact Table List
No. Symbol Element Atomic weight (u) Density (g/cm³) Melting point (K) Boiling point (K) Electronegativity Discovered
11NaSodium22.98980.968370.9441156.090.931807
12MgMagnesium24.3041.73892313631.311755
13AlAluminium26.98152.7933.4727431.611824
14SiSilicon28.0842.329168735381.91823
15PPhosphorus30.97381.823--2.191669
16SSulfur32.0592.07388.36717.82.582000 BC
17ClChlorine35.4463.2171.6239.113.161774
18ArArgon39.7921.78483.8187.302-1894