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Electrons, protons and neutrons are known a
a. subatomic particles. b. types of atoms.
Protons are
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B. Type of atom...
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Key Points
An atom is composed of two regions: the nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus.
Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams, which scientists define as one atomic mass unit (amu) or one Dalton.
Each electron has a negative charge (-1) equal to the positive charge of a proton (+1).
Neutrons are uncharged particles found within the nucleus.
Key Terms
atom: The smallest possible amount of matter which
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