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10 terms

6th Science Ch 1 Lesson 1

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electrons
negatively charged particles in an atom
proton
positively charged particles in an atom
neutron
neutrally charged particle in an atom
electron cloud
region surrounding the nucleus that contains the electrons
atomic number
the number of protons in the nucleus of each atom of that element
isotopes
atoms of the same element that have different numbers of neutrons
mass number
the sum of the numbers of protons and neutrons in the nucleus of an atom
atomic mass
weighted average mass of all the isotopes of an element,
nucleus
the positively charged dense center of an atom
ion
an atom that has a negative or positive charge because it has gained or lost one or more electrons