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learning guide 12
vocabulary for learning guide 12 dr.heiny
| Question | Answer |
|---|---|
| Atomic mass | the mass of an isotope of an element measured in units formerly based on the mass of one hydrogen atom taken as a unit or on 1/16 the mass of one oxygen atom, but after 1961 based on 1/12 the mass of the carbon-12 atom. |
| Atomic number | the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus. |
| Electrons | Also called negatron. Physics, Chemistry . an elementary particle that is a fundamental constituent of matter, having a negative charge of 1.602 × 10 −19 coulombs |
| Isotopes | any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. |
| Neutrons | an elementary particle having no charge, mass slightly greater than that of a proton, |
| Protons | a positively charged elementary particle that is a fundamental constituent of all atomic nuclei. |
| Quarks | any of the hypothetical particles with spin 1/2, baryon number 1/3, and electric charge 1/3 or −2/3 that, together with their antiparticles, are believed to constitute all the elementary particles classed as baryons and m |
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