Chapter 2 Atoms Molecules and Ions MULTIPLE CHOICE 1 Which of the following statements concerning atomic structure is are correct 1 Neutrons and electrons are found in space as a cloud around the nucleus 2 The nucleus contains all the positive charge of an atom 3 Electrons surround the nucleus and account for the majority of an atom s volume a 1 only b 2 only c 3 only d 2 and 3 e 1 2 and 3 ANS D a 7A b 9 c 10 d 19 e 0 ANS B 1 2 Rank the subatomic particles from least to greatest mass 3 Atomic number is the in the nucleus of an atom a electron mass proton mass neutron mass b electron mass neutron mass proton mass c electron mass proton mass neutron mass d electron mass proton mass neutron mass e electron mass proton mass neutron mass ANS D a number of electrons b number of protons c number of protons minus the number of neutrons d sum of the number of electrons and neutrons e sum of the number of neutrons and protons ANS B 4 The atomic number of fluorine is 5 How many protons neutrons and electrons are in a nitrogen 15 atom a 15 protons 15 neutrons 15 electrons b 15 protons 7 neutrons 15 electrons c 8 protons 7 neutrons 7 electrons d 7 protons 8 neutrons 7 electrons e 8 protons 7 neutrons 8 electrons 6 Which of the following atoms contains the fewest protons 7 What is the identity of a b c d e 232Th 231Pa 245Pu 238U 232Pa a Ni b Zn c Rn d Ce e Pd ANS A a b c d e and and and and and 8 Which two of the atoms below have the same number of neutrons 9 An element consists of three isotopes The abundance of one isotope is 92 21 and its atomic mass is 27 97693 u The abundance of the second isotope is 4 70 and its atomic mass is 28 97649 u The atomic mass of the third isotope is 29 97376 u What is the average atomic mass of the element a 28 09 u b 28 98 u c 28 96 u d 29 87 u e 29 07 u 10 Group 1A elements are also known as 11 Which three elements are likely to have similar chemical and physical properties a alkaline earth metals b alkali metals c chalcogens d halogens e noble gases a boron silicon and germanium b sodium magnesium and aluminum c sodium potassium and rubidium d oxygen sulfur and chlorine 2 12 The formula of acetic acid CH3CO2H is an example of a n e carbon nitrogen and oxygen a condensed formula b empirical formula c structural formula d e mass spectrum ionic compound formula 13 Identify the ions present in Na2SO4 and O2 and O2 and O2 a Na S2 b Na S2 c Na and SO4 d Na S2 e Na and SO4 2 14 For a nonmetal in Group 6A of the periodic table the most common monatomic ion will have a charge 15 What is the correct formula for an ionic compound that contains magnesium ions and phosphide ions 17 You have 2 50 g of each of the following elements Ca Cu Cs C and Cr Which sample contains the 16 What is the correct name for NH4NO3 a ammonia hydrogen nitrate b ammonia hydrogen nitride c ammonium nitric acid d ammonium nitrate e ammonium nitride largest number of atoms a Ca b Cu c Cs d C e Cr ANS D 18 Calculate the number of moles in 0 48 g Cu of a 3 b 2 c 1 d 1 e 2 a MgP b MgP2 c Mg3P2 d Mg3 PO4 2 e Mg2P3 3 19 What is the molar mass of sodium sulfate a 0 033 mol b 0 48 mol c 31 mol 3 mol d 7 6 10 e 1 3 102 mol a 55 06 g mol b 119 1 g mol c 78 05 g mol d 142 0 g mol e 110 0 g mol a 2 055 H 32 69 S 65 25 O b 1 028 H 32 69 S 66 28 O c 28 57 H 14 29 S 57 17 O d 1 028 H 33 72 S 65 25 O e 2 016 H 32 07 S 65 91 O is the empirical formula for this molecule a C2H6O b C3H4O c C3H8O2 d C4H6O2 e C4H8O3 20 What is the mass percent of each element in sulfuric acid H2SO4 21 A molecule is found to contain 47 35 by mass C 10 60 by mass H and 42 05 by mass O What 4