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Unit 5 Vocabulary Atom- the basic particle from which all elements are made Theory-an unifying explanation for a broad range of hypotheses and observations Electron- a tiny, negatively charged particle that moves around the outside of the nucleus of an atom Model-a representation of a complex object or process, used to help people understand a concept that they cannot observe directly Nucleus- the central core of an atom which contains protons and neutrons Electron cloud- the region of an atom where electrons are likely found, surrounds the nucleus Proton- small, positively charged particles that are found in the nucleus of an atom Atomic mass unit- (amu) the SI unit used to express the masses of particles in atoms Neutron-a small particle in the nucleus of the atom, with no electrical charge Atomic number-the number of protons in the nucleus of an atom Isotope-an atom with the same number of protons and a different number of neutrons from other atoms of the same element Mass number – the sum of protons and neutrons in the nucleus of an atom Atomic mass- the average mass of all the isotopes of an element UNIT 5 Vocabulary 1. Atom 2. Theory-an unifying explanation for a broad range of hypotheses and observations 3. Electron 4. Model 5. Nucleus (#2) 6. Electron cloud- the region of an atom where electrons are likely found, surrounds the nucleus 7. Proton 8. Atomic mass unit- (amu) the SI unit used to express the masses of particles in atoms 9. Neutron 10. Atomic number 11. Isotope 12. Mass number 13. Atomic mass