What is most of an atom made up of?
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The main mass of an atom is made up of the nucleus, made up of neutrons and protons. However it takes up very little space compared to the whole atom. read more
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Every atom is composed of a nucleus and one or more electrons bound to the nucleus. The nucleus is made of one or more protons and typically a similar number of neutrons. Protons and neutrons are called nucleons. More than 99.94% of an atom's mass is in the nucleus. read more
Source: en.wikipedia.org
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