Name___________________________________                             

Atoms, Molecules & Ions

DIRECTIONS: Circle the answer that best completes each statement.

1. The elements whose symbols are P, C, and N are
  (a) potassium, cadmium, and nickel.
  (b) potassium, carbon, and nitrogen.
  (c) phosphorus, calcium, and neon.
  (d) phosphorus, carbon, and nitrogen.

a			b			c			d


2. The elements whose symbols are Mg, Ba, and Pt are
  (a) manganese, barium, and plutonium.
  (b) mercury, beryllium, and polonium.
  (c) magnesium, barium, and platinum.
  (d) mendelevium, bromine, and protactinium.

a			b			c			d


3. The symbols of bromine, oxygen, and sulfur are
  (a) Br, O, and S.
  (b) Br, Ox, and Sr.
  (c) B, O, and S.
  (d) B, Ox, and Sr.

a			b			c			d


4. H2SO4
  (a) ionizes in water.
  (b) is the formula of sulfuric acid.
  (c) is the formula of sulfurous acid.
  (d) is an oxoacid.

a&c			a,c&d			b&d			a,b&d


5. Which of the following statements are true?
  (a) The formula of hydrochloric acid is HCl.
  (b) The formula of dinitrogen trioxide is N2O3.
  (c) The formula of hypochlorous acid is HClO.
  (d) The formula of phosphoric acid is H2PO3.

all of the		a&b			a,b&c			a,b&d
above



6. The neutral atom 65Cu contains
  (a) 29 neutrons.
  (b) 29 protons.
  (c) 65 neutrons.
  (d) 65 electrons
	
a&b			b&d			c only			b only


7. The ion 59Co+2 contains
  (a) 59 neutrons and 27 protons.
  (b) 29 protons and 27 electrons.
  (c) 27 protons and 32 neutrons.
  (d) 27 protons and 27 electrons.

a			b			c			d


8. Which of the following sets of elements are all in the same group of
     the periodic table?
  (a) I, Br, F
  (b) Na, Ca, Mg
  (c) C, Si, N
  (d) F, C, O

a only			b,c&d			b&c			a&c


9. Compounds in which the anion is O-2 and the cation
    is either Fe+2 or Fe+3 can have the formulae
  (a) O2Fe3 or Fe3O2
  (b) FeO or FeO2
  (c) Fe2O or Fe3O
  (d) Fe2O3 or FeO

a			b			c			d


10. The formulae of compounds which contain no other ions other
        than K+, Sr+2, Br- or O-2 can include
  (a) SrBr2
  (b) KBr
  (c) SrO
  (d) KO2

all of the		d only			c&d			a,b&c
above



11. Which of the following statements are(is) true?
  (a) The existence of both H2O and H2O2
         illustrates the law of multiple proportions..
  (b) Most of the volume of an atom is taken up by neutrons.
  (c) An electron and proton have approximately equal masses.
  (d) For any ion, the number of protons is always greater
         than the number of electrons.

a only			b,c&d			b&d			a&c


12. When Ernest Rutherford said, "It was as though you had fired a
      15-inch shell at a piece of tissue paper and it had bounced back
       and hit you," he was referring to the deflection of
  (a) cathode rays in an oil chamber
  (b) electrons
  (c) alpha particles
  (d) protons

a only			a&b			c&d			c only


13. Which periods contain eight elements?
  (a) the first period
  (b) the second period
  (c) the third period
  (d) the fourth period

a,c&d			b&c			c only			d only


14. Which of the following staements are(is) true?
  (a) The atomic number of an element is equal to the number of protons in the
         nucleus of an atom of that element.
  (b) Isotopes of the same element have different atomic numbers.
  (c) 23Na has a mass number of 23.
  (d) An anion is a negatively charged ion.

a only			a,b&d			a,c&d			a&d


15. Sodium
  (a) is an alkaline earth metal.
  (b) forms ions with a +2 charge.
  (c) can combine with iodine to form Na2I.
  (d) is a nonmetal.

a,b&c			d only			b&d           		none of 
		                  					 the above

	
16. Which of the following ions are most likely to form?
  (a) Ba+1
  (b) Al+3
  (c) Li+2
  (d) S-2

a&c			b&d			c only			a,b&c 


17. The names of the polyatomic ions NH4+, SO3-2, and CO3-2 are:
  (a) nitrite, sulfate, and carbonate
  (b) nitrate, sulfoxylate, and carboxide
  (c) nitrohydride, sulfotrioxylate, and oxocarbonium
  (d) ammonium, sulfite, and carbonate

a			b			c			d


18. Yttrium-90 is a radionuclide which is being studied for use in the
       treatment of cancer.  Which of the following describes the 90Y+3 ion?
  (a) It has 36 electrons.
  (b) It has 39 neutrons.
  (c) It has 51 neutrons.
  (d) It can form 90Y(NO3)3.

a,c&d			c&d			b,c&d			a&c


19. Which of the following contains 15 protons and 10 electrons?
  (a) Mg+2
  (b) P+5
  (c) Al+3
  (d) H2O

a			b			c			d


20. Which of the following are(is) true?
  (a) Carbon is a metal.
  (b) The mass number is twice the atomic number.
  (c) The formula of calcium chloride is Ca2Cl.
  (d) The elements of the first period are known as the noble gases.

a&b			b&d			c only      		 none of
									the above