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 ...

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

But how many of these elements do you know? Test your knowledge and compete with other Live Science readers to see who can ...

Scientists have found that our bodies need 28 different elements to function properly. These are almost one-quarter of the periodic table and are mainly found in the first four periods.

Using the periodic trend of group 1 elements, can you predict how a small piece of potassium (K) will react when it is added to water? Non-metal elements are on the right of the periodic table.