Bohr created his own version of the table in 1922, based on experimental measurements of electron energies (along with some guidance from the periodic law). Bohr’s table added elements ...

The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

Free interactive and download to print GCSE Chemistry flashcards to help prepare for your GCSE exams. Revise topics such as atoms, elements and compounds, mixtures, atomic structure, Mendeleev's ...