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- IPA (key): /əˈtɒm.ɪk//ˈnʌm.bɚ/
- (countable) The number of protons in an atom is the atomic number. It is also the position in the periodic table of elements.
- Hydrogen has an atomic number of 1. It has 1 proton, and is the first element in the periodic table.
- Heavy elements, such as gold have a high atomic number.