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Download Chapter 11 Vocabulary 1. Atom – the smallest particle into which an
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Transcript
Chapter 11 Vocabulary 1. Atom – the smallest particle into which an element can be divided and still be the same substance. 2. Electrons – the negatively charged particles found in all atoms. 3. Nucleus – the tiny, extremely dense, positively charged region in the center of the atom. 4. Electron clouds – the regions inside an atom where electrons are likely to be found. 5. Protons – the positively charged particles of the nucleus. 6. Atomic mass unit – the SI unit used to express the masses of particles in an atom. 7. Neutrons – the particles of the nucleus that have no charge. 8. Atomic number – the number of protons in the nucleus of an atom. 9. Isotopes – atoms that have the same number of protons but have different numbers of neutrons. 10. Mass number – the sum of the protons and neutrons in an atom. 11. Atomic mass – the weighted average of the masses of all of the naturally occurring isotopes of an element.
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