final exam MC review file 1 ANSWERS

final exam MC review file 1 ANSWERS - The number of...

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The number of neutrons in the nucleus of a specific atom is equal to its (A) atomic mass. (B) mass number. (C) atomic number. (D) mass number minus the atomic number. In all neutral atoms, there are equal numbers of (A) protons and neutrons. (C) neutrons and electrons. (B) positrons and electrons. (D) electrons and protons . The species designated as X is (A) Fe (B) Ge (C) Ba (D) Cr What do these have in common? 20 Ne 19 F 24 Mg 2+ (A) the same number of protons (B) the same number of neutrons (C) the same number of electrons (D) the same size Which statement concerning the structure of the atom is correct? (A) Protons and neutrons have most of the mass and occupy most of the volume of the atom. (B) Electrons have most of the mass and occupy most of the volume of the atom. (C) Electrons have most of the mass but occupy very little of the volume of the atom. (D) Protons and neutrons have most of the mass but occupy very little of the volume of the atom. 1
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The number of neutrons in the Cl ion is (A) 17 (B) 20 (C) 21 (D) 37 An argon atom is isoelectronic with (A) Cl (B) Ca (C) Ti 4+ (D) N 3– The stable isotope of fluorine is F. The charge on the nucleus of the fluoride ion, F , is (A) l+ (B) 7+ (C) 9+ (D) l– Which pair of particles has the same number of electrons? (A) F , Mg 2+ (C) Br , Se (B) Ne, Ar (D) Al 3+ , P 3– An atom of strontium–90 (Sr) contains (A) 38 electrons, 38 protons, 52 neutrons. (B) 38 electrons, 38 protons, 90 neutrons. (C) 52 electrons, 52 protons, 38 neutrons. (D) 52 electrons, 38 protons, 38 neutrons. The number of neutrons in the nucleus of an atom of Al is (A) 40 (B) 13 (C) 27 (D) 14 (E) 9 What happens when an atom of an electropositive metal becomes an ion? (A) It gains electrons. (B) It is reduced. (C) The ionic radius becomes greater than the atomic radius. (D) It serves as an oxidizing agent. (E) None of these. Which statement is true? 2
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(A) The nucleus of an atom contains neutrons and electrons. (B) The atomic number of an element is the number of protons in one atom. (C) The mass number of an atom is the number of protons in the nucleus plus the number of electrons outside. (D) The number of electrons outside the nucleus is the same as the number of neutrons in the nucleus. (E) A Cl ion is a chlorine atom that has lost one electron. The orbitals of 2 p electrons are often represented as being (A) elliptical. (D) tetrahedral. (B) pyramidal. (E) spherical. (C) dumbbell shaped. The mass number of an atom represents (A) the number of neutrons in the atom. (B) the number of protons in the atom. (C) the mass, in grams, of the atom. (D) the number of electrons outside the nucleus of the atom. (E) the sum of the number of protons and neutrons in the atom. The ionization potential is (A) the voltage required to remove an electron from an atom or ion. (B) the voltage required to cause a weak electrolyte to ionize. (C) the same as the electrode potential.
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final exam MC review file 1 ANSWERS - The number of...

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