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 periodic table organizes chemical elements based on atomic weight, electron configurations, and chemical properties, ...

Atoms of non-metal elements gain electrons in some of their reactions to form negative ions. The ions formed ... See the study guide on groups in the periodic table for more information.

Although metal ions are central to all of biochemistry, a group of elements clustered in the early part of the periodic table—carbon, nitrogen, oxygen and phosphorus—are highly represented in ...

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