Web Definition: Chemical Elements
A chemical element, often called simply element, is a substance that cannot be divided or changed into different substances by ordinary chemical methods. The smallest particle of such an element is an atom, which consists of electrons centered around a nucleus of protons & neutrons. The atomic number of an element, Z, is equal to the number of protons in the atom of the element. For example, carbon, the element with atomic number 6, contains 6 protons in its nucleus. All atoms of an element have the same atomic number & contain the same number of protons. However, atoms of the same element may differ in the number of neutrons & are known as isotopes of the element. The atomic mass of an element, A, is measured in atomic mass units & is roughly equal to the sum of the protons & neutrons in the nucleus of an atom of the element. A number of elements are radioactive & in undergoing radioactive decay transmute into a different element. The lightest elements are hydrogen & helium, which were the first elements to appear in the Big Bang.
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