organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic number. Scientists use the periodic table to quickly refer to information ...

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 ...

Mrs Roberts: Well, the modern periodic table shows us all of the elements arranged in ... similar physical and chemical properties and show trends. The table below shows the melting points of ...