ch2 - Exam Name MULTIPLE CHOICE Choose the one alternative...

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Unformatted text preview: Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The smallest stable units of matter are A) protons. B) molecules. C) electrons. D) neutrons. E) atoms. 1) 2) The "atomic number" of an atom is determined by the number of ________ it has. A) protons + neutrons B) electrons C) neutrons D) protons + electrons E) protons 2) 3) Isotopes of an element differ in the number of A) electron clouds. B) neutrons in the nucleus. C) electrons in the nucleus. D) protons in the nucleus. E) electrons in energy shells. 3) 4) The mass number represents the number of A) electrons in an ion. B) neutrons + electrons. C) protons + neutrons. D) protons in an atom. E) neutrons in an atom. 4) 5) The innermost electron shell in an atom holds up to ________ electrons. A) 8 B) 1 C) 2 D) 6 E) 4 5) 6) The "atomic weight" of an atom reflects the average number of A) protons + neutrons. B) neutrons. C) protons + neutrons + electrons. D) protons. E) electrons. 6) 7) Radioisotopes have unstable A) nuclei. B) protons. C) isotopes. D) electron clouds. E) ions. 7) 1 8) The chemical behavior of an atom is determined by A) the number of neutrons. B) the outermost electron shell. C) the number of protons. D) the mass of the nucleus. E) the size of the atom. 8) 9) Ions with a + charge are called A) anions. B) isotopes. C) radicals. D) cations. E) positrons. 9) 10) The weakest bond between two atoms is the ________ bond. A) ionic B) covalent C) hydrogen D) nonpolar E) polar 10) 11) Ionic bonds are formed when A) a pair of electrons is shared unequally by two atoms. B) hydrogen forms bonds with negatively charged atoms. C) electrons are completely transferred from one atom to another. D) two or more atoms lose electrons at the same time. E) atoms share electrons. 11) 12) In a molecule of nitrogen, three pairs of electrons are shared by two nitrogen atoms. The type of bond that is formed is an example of a(n) A) hydrogen bond. B) double divalent bond. C) single trivalent bond. D) triple covalent bond. E) polar covalent bond. 12) 13) If a pair of electrons is unequally shared between two atoms, a(n) ________ occurs. A) double covalent bond B) single covalent bond C) triple covalent bond D) hydrogen bond E) polar covalent bond 13) 14) Elements that have atoms with full outer shells of electrons A) will normally form anions. B) will form many compounds. C) will normally form cations. D) are inert gases. E) frequently form hydrogen bonds. 14) 2 15) Which one of the following statements is not correct about the reaction H 2 + Cl 2 → 2 HCl? A) One molecule of hydrogen contains two atoms. B) H 2 and Cl 2 are the reactants....
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ch2 - Exam Name MULTIPLE CHOICE Choose the one alternative...

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