Interactive periodic table

All 118 elements. Tap an element to see its atomic number, group and period, and the lessons that go with it. Groups are numbered the GCSE way: 1, 2, then 3 to 7 and 0 for the noble gases.

LanthanidesActinides

s block (groups 1 and 2)d block (transition metals)p block (groups 3 to 0)f block

Choose an element above.

What the table tells you

Atomic number is the number of protons in the nucleus. The table is in order of atomic number.
Groups are the columns. Elements in the same group have the same number of electrons in their outer shell, so they react in similar ways.
Periods are the rows. The period number is the number of occupied electron shells.
Metals are on the left and in the middle; non-metals are on the right.

Relative atomic masses are printed on the periodic table you are given in the exam, so use that one in calculations.

Lessons: The periodic table · Group 1: the alkali metals · Group 7: the halogens · Group 0: the noble gases · Transition metals, alloys and corrosion

Element names, symbols, atomic numbers, groups and periods follow IUPAC and were checked against two independent element databases.