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Which is the first element on the periodic table?
- Hydrogen:Science loves organization. Toward that end, the Periodic Table of Elements is a chart that arranges all of the chemical elements into an informative array. The arrangement is based on the element's atomic number (the number of protons in the nucleus of an atom). Each row is called a period and each column is called a group. Each element in a group behaves chemically in a similar fashion. In a row, each element has a higher energy level than the element preceding it. Source: LiveScience.com; RSC.org
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