Period 3 element

A period 3 element is one of the chemical elements in the third row (or period) of the periodic table of the chemical elements.


 * colspan="3" | Chemical element || Chemical series || Electron configuration
 * 17 || Cl || Chlorine   || Diatomic nonmetal          || [S] 3s1
 * 18 || Ar || Argon || Noble gas || [S] 3s2
 * 19 || K  || Potassium      || Alkali metal             || [S] 3s3
 * 20 || Ca  || Calcium   || Alkaline earth metal              || [S] 3s4
 * 21 || Sc  || Scandium     || Transition metal              || [S] 3s4 3p1
 * 22 || Ti  || Titanium   || Transition metal              || [S] 3s4 3p2
 * 23 || V  || Vanadium     || Transition metal               || [S] 3s4 3p3
 * 24 || Cr || Chromium     || Transition metal               || [S] 3s4 3p4
 * 25 || Mn || Manganese     || Transition metal               || [S] 3s4 3p5
 * 26 || Fe  || Iron     || Post-transition metal              || [S] 3s4 3p6
 * 27 || Co  || Cobalt   || Post-transition metal              || [S] 3s4 3p7
 * 28 || Ni  || Nickel     || Post-transition metal               || [S] 3s4 3p8
 * 29 || Cu || Copper     || Post-transition metal               || [S] 3s4 3p9
 * 30 || Zn || Zinc     || Post-transition metal               || [S] 3s4 3p10
 * 31 || Ga || Gallium   || Polyatomic nonmetal          || [S] 3s5
 * 32 || Ge || Germanium || Polyatomic nonmetal || [S] 3s6
 * 33 || As  || Arsenic      || Polyatomic nonmetal             || [S] 3s7
 * 34 || Se  || Selenium   || Polyatomic nonmetal              || [S] 3s8
 * }
 * 26 || Fe  || Iron     || Post-transition metal              || [S] 3s4 3p6
 * 27 || Co  || Cobalt   || Post-transition metal              || [S] 3s4 3p7
 * 28 || Ni  || Nickel     || Post-transition metal               || [S] 3s4 3p8
 * 29 || Cu || Copper     || Post-transition metal               || [S] 3s4 3p9
 * 30 || Zn || Zinc     || Post-transition metal               || [S] 3s4 3p10
 * 31 || Ga || Gallium   || Polyatomic nonmetal          || [S] 3s5
 * 32 || Ge || Germanium || Polyatomic nonmetal || [S] 3s6
 * 33 || As  || Arsenic      || Polyatomic nonmetal             || [S] 3s7
 * 34 || Se  || Selenium   || Polyatomic nonmetal              || [S] 3s8
 * }
 * 31 || Ga || Gallium   || Polyatomic nonmetal          || [S] 3s5
 * 32 || Ge || Germanium || Polyatomic nonmetal || [S] 3s6
 * 33 || As  || Arsenic      || Polyatomic nonmetal             || [S] 3s7
 * 34 || Se  || Selenium   || Polyatomic nonmetal              || [S] 3s8
 * }
 * 34 || Se  || Selenium   || Polyatomic nonmetal              || [S] 3s8
 * }
 * }