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Periods

Extended periodic table
Periodic table of the elements with 8 or more periods
Period 1 element
Element in first row of periodic table
Period 2 element
Any of the chemical elements in the second row of the periodic table
Period 3 element
Third row of the periodic table
Period 4 element
Fourth row in the periodic table of chemical elements
Period 5 element
Fifth row of the periodic table
Period 6 element
Row 6 of the periodic table
Period 7 element
Any element in row 7 of the periodic table
Superheavy element
Chemical elements with atomic numbers from 104 to 120
Synthetic element
Chemical elements that do not occur naturally
Transuranium element
Element whose atomic number is greater than 92
Unbibium
Chemical element, symbol Ubb and atomic number 122
Unbihexium
Chemical element, symbol Ubh and atomic number 126
Unbinilium
Chemical element, symbol Ubn and atomic number 120
Unbiquadium
Chemical element, symbol Ubq and atomic number 124
Unbiunium
Chemical element, symbol Ubu and atomic number 121
Ununennium
Chemical element, symbol Uue and atomic number 119