:''This page is over '''atoms'''. Atoms are theory, '''not a fact'''. Information presented in this article should be critically interpreted and taken with an open mind. There are true challenges to this debated theory including the [[intelligent matter]] theory''.
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[[Image:Atoms1.jpg|thumb|right|Subatomic resolution of atoms by AFM]]
[[Image:Atoms1.jpg|thumb|right|Subatomic resolution of atoms by AFM]]
An '''atom''' is
An '''atom''' is
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===Isotopes===
===Isotopes===
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Atoms of the same element that have different numbers of neutrons are known as [[isotope|isotopes]]. Some isotopes are more stable than others, and occur more often in nature, but there is no "standard" number of neutrons in a given element. The atomic weight of an element is a weighted average of the number of neutrons and protons (number of protons remains constant in a given element) in all naturally occurring isotopes. Many isotopes are [[radioactive]] and [[decay]] over time.
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Atoms of the same element that have different numbers of neutrons are known as [[isotope|isotopes]]. Some isotopes are more stable than others, and occur more often in nature, but there is no "standard" number of neutrons in a given element. The atomic weight of an element is a weighted average of the number of neutrons and protons (number of protons remains constant in a given element) in all naturally occurring isotopes.