Chapter2 - Chapter 2 Atoms Molecules and Ions Student NOTE...

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Chapter 2 Atoms Molecules and Ions Student: ___________________________________________________________________________ NOTE: A periodic table is required to work many of the problems in this chapter. 4. An anion is defined as A. a charged atom or group of atoms with a net negative charge. B. a stable atom. C. a group of stable atoms. D. an atom or group of atoms with a net positive charge. 9. What percentage of the mass of a carbon-12 atom is contributed by its electrons? Given the mass of an electron is (1/1836) amu. 10. Atoms of the same element with different mass numbers are called 11. How many neutrons are there in an atom of lead whose mass number is 208?
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12. An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons? (p = proton, n = neutron, e = electron) A. 15 p, 16 n, 15 e B. 16 p, 15 n, 16 e C. 16 p, 31 n, 16 e D. 32 p, 31 n, 32 e E.16 p, 16 n, 15 e 13. Give the number of protons (p), electrons (e), and neutrons (n) in one atom of chlorine-37. 14. Which one of these species is an ion? 15. Two isotopes of an element differ only in their 16. A magnesium ion, Mg 2+ , has A. 12 protons and 13 electrons. B. 24 protons and 26 electrons. C. 12 protons and 10 electrons. D. 24 protons and 22 electrons. E.12 protons and 14 electrons. 17. An aluminum ion, Al 3+ , has:
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18. An oxide ion, O 2- , has: 19. A sulfide ion, S 2- , has: 20. How many protons and electrons are present in one Br - ion? A. 35 p, 35 e B. 80 p, 81 e C. 35 p, 34 e D. 35 p, 36 e E.80 p, 34 e 45. The mineral pyrolusite is a compound of manganese-55 and oxygen-16. If 63% of the mass of pyrolusite is due to manganese, what is the empirical formula of pyrolusite? 46. The mineral manganosite is a compound of manganese-55 and oxygen-16. If 77% of the mass of manganosite is due to manganese, what is the empirical formula of manganosite?
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