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 Glossary
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| Appendix |
| PDF Table |
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| EDITORS: |
 InglesiAditya Vardhan Eni Generalic |
 FrancesiMichel Ditria |
 CroatoEni Generalic Marija Bralic Slobodan Brinic |
 TedescoMarc Hens |
 Italianoeditors wanted |
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A |
Abundance of elements | Atomic number | Atomic radius |
- Abundance of elements
- The most abundant elements in the earth's crust are oxygen (49.5%), silicon (25%), aluminium (7.5%), iron (4.7%), calcium (3.4%), sodium (2.6%), potassium (2.4%), magnesium (1.9%) and hydrogen (1.9%). This nine elements makes up almost 99% of the Earth's crust.
- Atomic number
- Atomic number, Z, is a characteristic property of an element, equal to the number of protons present in the nucleus of an atom. In neutral species, it is also equal to the number of electrons present in the atom.
- Atomic radius
- Atomic radius is usually referred to as one half of equilibrium internuclear distance between two adjacent atoms (which may either bonded covalently or present in a closely packed crystal lattice ) of an element.
