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Name ve a 4 Atomic Structure _ neviewsheet [eee vezaeameoseeszesenovaz eas roer evs eseosazoroOFanSEOSOOaHE A Completion Use this complelicn exercise to check your understanding of the concepts and terms that are introduced in this chapter. Each blank can be completed with a term, shot plirase, or number. Atoms of cech cleremi are i from the atoms af all other elements, Dalton theorized that atoms are indivisible, but the discovery of particles changed this theory. We now know that atoms are mede up of electrons, which have a charge; 4 , which have a positive charge; and 5___, which are neutral. The latter two particles are found in 6. ROCLENS. the __§ __ of the ao. 7, Kody ry bor Yas Itwas _..7__ who discovered the nucleus of the atom. The 8. > S, yy Rin 4 charge and it occupies a very small vol- 8, Beer ares “necleus has 2 ume of the ator. In contrast, the negatively charged __9 LO, prey i (elec) 44 occupy most of the volume of the atom. TL. ow onion en 44 The number of __10 “in the nucleus of the aiom is the 12. Hechyrie atomic __11__ of that element: Because atoms are clectrically 13, pre, te AD (olen ss “jeutral, the number of protons end _ 12 in an atom are 14, nea yorehS 46 equal. The sum of the _13__ and neutrons is the mass number. 15. nelobes, 46 Atoms of the same element are identicei in most respects, but 16. OA Nee, mass AF they can differ in the number of _ ..in the nucleus. Atoms 17, \ e 46 that havé the same number of protons but different mass num- 18. HO 46 bers are called 19, te 46° 0. \O 4s The _.48_ ofan element is the weighted average of the masses of the isatopes of that elernent. Two isotopes of sulfur are 32.5 and 3S. An atom of the gulfur-32 isotope contains ___17 _ protons and _18 ___ neutrons. The sulfur-34 isotope has __19 _. protons ané 20" reutrons. Chapter 4 Atomic Strucrsre 23 
