Unit 2: Atomic Concepts and Periodic Table (Level 1)
of an atom. The protons have a mass of approximately . ONE AMU. The number of protons in the nucleus, also called the . ATOMIC NUMBER, is responsible for determining the type of atom, or the . ELEMENT. The . NEUTRONS. are also in the nucleus with the protons, together their sum is the . MASS NUMBER. Neutrons are almost equal in mass to the ... ................
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