Unformatted text preview: atom Particles in the Nucleus Proton • Positively charged particle ( + ) • Number of protons in the nucleus for a particular element is always constant (and fixed) • The number of protons ranges from 1 ---> 108 from which the atomic number is assigned. • An element is defined by its number of protons. • Each proton has a relative mass of "1" (For biology purposes, this is fine. It's actually 1 dalton, which is a relative measure of the mass of the hydrogen atom). Neutron • No electrical charge • Mass of "1" (just a tiny bit heavier than the proton; not enough for us to be concerned about). • About the same number of neutrons as protons/atom, although the ratio changes with larger atoms. .. • The number of neutrons plus the number of protons gives the atomic mass (or atomic weight) of an atom....
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.
- Spring '10