The covalent radius (a measure of how large individual atoms are) shows different trends if you are moving ... As you move from left to right across the periodic table, atoms have more electrons ...

The periodic table’s arrangement also allows scientists to discern trends in element properties ... to reflect over 150 years of scientific development and understanding in chemistry and physics.

Chemists use symbols and formulae to represent elements and compounds. Word equations and balanced chemical equations represent the changes that happen in chemical reactions. Mixtures - AQA There ...