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See also: Elements (table) Elements Element Symbol Atomic Number Atomic Weight 1 Melting Point (Degrees Celsius) Boiling Point (Degrees Celsius) actinium Ac 89 (227) 1050. 3200. ±300 aluminum Al 13 26.98154 660.37 2467. americium Am 95 (243)

See also: Elements (table) Elements
Element Symbol Atomic Number Atomic Weight 1 Melting Point
(Degrees Celsius)
Boiling Point
(Degrees Celsius)

actinium Ac 89 (227) 1050. 3200. ±300
aluminum Al 13 26.98154 660.37 2467.
americium Am 95 (243) 1172. 2600.
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Properties of an element are sometimes classed as either chemical or physical. Chemical properties are usually observed in the course of a chemical reaction, while physical properties are observed by examining a sample of the pure element. The chemical properties of an element are due to the distribution of electrons around the atom's nucleus, particularly the outer, or valence, electrons; it is these electrons that are involved in chemical reactions. A chemical reaction does not affect the atomic nucleus; the atomic number therefore remains unchanged in a chemical reaction.

Some properties of an element can be observed only in a collection of atoms or molecules of the element. These properties include color, density, melting point, boiling point, and thermal and electrical conductivity. While some of these properties are due chiefly to the electronic structure of the element, others are more closely related to properties of the nucleus, e.g., mass number.

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