This document contains multiple choice questions about atomic structure and chemical bonding. It tests knowledge of subatomic particles, isotopes, ion formation, ionic and molecular compounds, polyatomic ions, and acids. The questions cover naming ions and compounds correctly, writing chemical formulas, identifying cation and anion pairs that form ionic compounds, and distinguishing between ionic and molecular compounds.

20. 1. Atomshave no electriccharge because they
a. have an equal numberof chargedand
nonchargedparticles.
b. have neutronsintheirnuclei.
c. have an equal numberof electronsand
protons.
d. have an equal numberof neutronsand
protons.
2. A subatomicparticle thathas a negative charge is
calleda(n)
a. molecule. c. element.
b. electron. d. compound.
3. Which of the followingstatementsis nottrue?
a. Protonshave a positive charge.
b. A nucleushasa positive charge.
c. Neutronshave nocharge.
d. Neutronshave anegative charge.
4. What is an atom’snucleusmade of?
a. protonsand neutrons c. onlyneutrons
b. onlyprotons d. anodes
5. The charge of an atom is
a. positive. c. negative.
b. neutral. d. unbalanced.
6. An ironatom has an atomicmass of 56. Its atomic
numberis26. How manyneutronsdoesthe iron
atom have?
a. 30 c. 26
b. 56 d. 82
8. An element’satomicnumberisequal toits
numberof
a. protons. c. valence electrons
b. neutrons. d. protonsand
neutrons.
9. Two differentisotopesof anelementhave
different
a. numbersof neutrons. c. atomicnumbers.
b. numbersof protons. d. numbersof
electrons.
10. What isthe massnumberof an elementthat
has
19 protons,19 electrons,and20 neutrons?
a. 19 c. 39
b. 20 d. 58
11. Whichstatementaboutthe atom’snucleusis
correct?
a. The nucleusismade of protonsandneutrons
and has a negative charge.
b. The nucleusismade of protonsandneutrons
and has a positive charge.
c. The nucleusismade of electronsandhasa
positive charge.
d. The nucleusismade of electronsandhasa
negative charge.
12. Oxygen’satomicnumberis 8.Thismeansthat
an oxygenatomhas
a. eightneutronsinitsnucleus.
b. a total of eightprotonsandneutrons.
c. eightprotonsinitsnucleus.
d. a total of eightneutronsandelectrons.
13. Whichstatementaboutan element’saverage
atomicmass iscorrect?
a. It isdeterminedbycountingthe numberof

21. isotopesinasample of the element.
b. It isequal to one-twelfththe massof the most
commonisotope.
c. It isa weightedaverage,socommonisotopes
have a greatereffectthanuncommonones.
d. It isbasedon an isotope’scharge,sonegatively
chargedisotopeshave agreatereffectthan
positive ones.
14. Anatom’s massnumberequalsthe numberof
a. protonsplusthe numberof electrons.
b. protonsplusthe numberof neutrons.
c. protons.
d. neutrons.
15. A Ca2+
iondiffersfroma Ca0
atomin that the
Ca2+
ion has
a. more electrons c. fewerprotons
b. more protons d. fewerelectrons
17. How manyelectronsdoesanelementhave with
a mass numberof 36?
a. 36 c. 72
b. 18 d. unknown
18. The nucleusof an atom consistsof 8 protons
and
6 neutrons.The total numberof electrons
present
ina neutral atomof thiselementis
a. 6 c. 2
b. 8 d. 14
19. Atomsof 16
O, 17
O,and18
O have the same
numberof
a. protons,but a differentnumberof electrons
b. electrons,butadifferentnumberof protons
c. protons,buta differentnumberof neutrons
d. neutrons,buta differentnumberof protons
20. All atomsof an elementhave the same
a. numberof neutrons c. atomic number
b. atomicmass d. massnumber
21. The atomic number is always equal to the total
number of
a. neutrons in the nucleus
b. protons in the nucleus
c. neutrons plus protons in the atom
d. protons plus electrons in the atom
22. How many protons are in the nucleus of an atom
of beryllium?
a. 2 c. 9
b. 4 d. 5
23. Which subatomic particle is negative?
a. proton c. electron
b. neutron d. nucleus
24. Which of the following particles has the least
mass?
a. neutron c. electron
b. proton d. hydrogennucleus
26. What isthe total numberof electronsinanMg+2
ion?
a. 10 c. 2
b. 24 d. 12
27. The atomic massof an elementisdefinedasthe
weightedaverage massof thatelement’s
a. naturallyoccurringisotopes
b. leastabundantisotope
c. radioactive isotopes
d. mostabundantisotope
28. Comparedtothe entire atom, the nucleusof the
atom is
a. smallerandcontainsmostof the atom’smass
b. smallerandcontainslittle of the atom’smass
c. largerand containsmostof the atom’smass
d. largerand containslittle of the atom’smass
.

22. Multiple Choice
Identify theletter of the choice thatbest completesthestatementor answersthequestion.
____ 1. What type of ionshave namesendingin -ide?
a. onlycations c. onlymetal ions
b. onlyanions d. onlygaseousions
____ 2. WhenGroup 2A elementsformions,they____.
a. lose twoprotons c. lose twoelectrons
b. gaintwo protons d. gaintwo electrons
____ 3. What isthe correct name forthe N ion?
a. nitrate ion c. nitride ion
b. nitrogenion d. nitrite ion
____ 4. Whennaminga transitionmetal ionthatcan have more than one common ioniccharge,the numerical
value of the charge isindicatedbya ____.
a. prefix c. Romannumeral followingthe name
b. suffix d. superscriptafterthe name
____ 5. Aluminumisagroup3A metal.WhichiondoesA1 typicallyform?
a. Al c. Al
b. Al d. Al
____ 6. In whichof the followingare the symbol andname forthe iongivencorrectly?
a. Fe :ferrousion;Fe :ferricion
b. Sn : stannicion;Sn :stannousion
c. Co : cobalt(II) ion;Co :cobaltousion
d. Pb : leadion;Pb :lead(IV)ion
____ 7. Whichof the followingcorrectlyprovidesthe name of the element,the symbolforthe ion,andthe
name of the ion?
a. fluorine,F ,fluoride ion c. copper,Cu ,cuprous ion
b. zinc,Zn , zincate ion d. sulfur,S ,sulfurousion
____ 8. The nonmetalsinGroups6A and 7A ____.
a. lose electronswhentheyformions
b. have a numerical charge that isfoundbysubtracting8 fromthe group number
c. all have ionswitha –
1 charge
d. endin -ate
____ 9. What isthe Stockname for chromicion?
a. chromium(I) ion c. chromium(III) ion
b. chromium(II) ion d. chromium(IV) ion
____ 10. Whichof the followingisNOTa cation?
a. iron(III) ion c. Ca
b. sulfate d. mercurousion
____ 11. In whichof the followingare the symbol andname forthe iongivencorrectly?
a. NH : ammonia;H : hydride c. OH : hydroxide;O :oxide

23. b. C H O : acetate;C O : oxalite d. PO : phosphate;PO :phosphite
____ 12. Whichof the followingcorrectlyprovidesthe namesandformulasof polyatomicions?
a. carbonate:HCO ; bicarbonate:CO
b. nitrite:NO ;nitrate:NO
c. sulfite:S ;sulfate:SO
d. chromate:CrO ; dichromate:Cr O
____ 13. An -ateor -ite at the endof a compoundname usuallyindicatesthatthe compoundcontains____.
a. fewerelectronsthanprotons c. onlytwoelements
b. neutral molecules d. a polyatomicanion
____ 14. Whichof the followingcompoundscontainsthe Mn ion?
a. MnS c. Mn O
b. MnBr d. MnO
____ 15. How are chemical formulasof binaryioniccompounds generallywritten?
a. cationon left,aniononright
b. anionon left,cationonright
c. Romannumeral first,thenanion,thencation
d. subscriptsfirst,thenions
____ 16. Whichof the followingformulasrepresentsanioniccompound?
a. CS c. N O
b. BaI d. PCl
____ 17. Whichelement,whencombinedwithfluorine,wouldmostlikelyformanioniccompound?
a. lithium c. phosphorus
b. carbon d. chlorine
____ 18. Whichof the followingshowscorrectlyanionpairand the ioniccompoundthe twoionsform?
a. Sn ,N ; Sn N c. Cr , I ; CrI
b. Cu , O ;Cu O d. Fe ,O ; Fe O
____ 19. Whichof the followingcorrectlyrepresentsanionpairandthe ioniccompoundthe ionsform?
a. Ca , F ; CaF c. Ba , O ; Ba O
b. Na ,Cl ; NaCl d. Pb ,O ; Pb O
____ 20. In whichof the followingisthe name andformulagivencorrectly?
a. sodiumoxide,NaO c. cobaltouschloride,CoCl
b. bariumnitride,BaN d. stannicfluoride,SnF
____ 21. Whichof the followingcompoundscontainsthe lead(II) ion?
a. PbO c. Pb2O
b. PbCl4 d. Pb2S
____ 22. Whichset of chemical name andchemical formulaforthe same compoundiscorrect?
a. iron(II) oxide,Fe O c. tin(IV) bromide,SnBr
b. aluminumfluorate,AlF d. potassiumchloride,K Cl
____ 23. What isthe correct formulaforpotassiumsulfite?
a. KHSO c. K SO
b. KHSO d. K SO

24. ____ 24. Whichset of chemical name andchemical formulaforthe same compoundiscorrect?
a. ammoniumsulfite,(NH ) S c. lithiumcarbonate,LiCO
b. iron(III) phosphate,FePO d. magnesiumdichromate,MgCrO
____ 25. What type of compoundisCuSO ?
a. monotomicionic c. polyatomicionic
b. polyatomiccovalent d. binarymolecular
____ 26. Whichpolyatomicionformsa neutral compoundwhencombinedwitha group1A monatomicionina
1:1 ratio?
a. ammonium c. nitrate
b. carbonate d. phosphate
____ 27. Sulfurhexafluoride isanexample of a____.
a. monatomicion c. binarycompound
b. polyatomicion d. polyatomiccompound
____ 28. Molecularcompounds are usually____.
a. composedof twoor more transitionelements
b. composedof positive andnegative ions
c. composedof twoor more nonmetallicelements
d. exceptionstothe lawof definite proportions
____ 29. What isthe endingforthe namesof all binarycompounds,bothionicandmolecular?
a. -ide c. -ade
b. -ite d. -ate
____ 30. Binarymolecularcompoundsare made of two____.
a. metallicelements c. polyatomicions
b. nonmetallicelements d. cations
____ 31. In naminga binary molecularcompound,the numberof atomsof each elementpresentinthe molecule
isindicatedby____.
a. Romannumerals c. prefixes
b. superscripts d. suffixes
____ 32. Whichof the followingcorrectlyshowsaprefix usedinnamingbinarymolecular compoundswithits
correspondingnumber?
a. deca-,7 c. hexa-,8
b. nona-,9 d. octa-,4
____ 33. Whichof the followingisabinarymolecularcompound?
a. BeHCO c. AgI
b. PCl d. MgS
____ 34. Whichof the followingformulasrepresentsamolecular compound?
a. ZnO c. SO
b. Xe d. BeF
____ 35. Whennamingacids,the prefix hydro- isusedwhenthe name of the acidanionendsin____.
a. -ide c. -ate
b. -ite d. -ic
____ 36. Whichof the followingshowsboththe correctformulaandcorrect name of an acid?
a. HClO ,chloricacid c. H PO ,phosphoricacid
b. HNO ,hydronitrousacid d. HI, iodicacid

25. ____ 37. What isthe name of H SO ?
a. hyposulfuricacid c. sulfuricacid
b. hydrosulfuricacid d. sulfurousacid
____ 38. Whenthe name of an anionthat ispart of an acidendsin -ite,the acidname includesthe suffix____.
a. -ous c. -ate
b. -ic d. -ite
____ 39. What isthe formulaforsulfurousacid?
a. H SO c. H SO
b. H SO d. H S
____ 40. What isthe formulaforphosphoricacid?
a. H PO c. HPO
b. H PO d. HPO
____ 41. What isthe formulaforhydrosulfuricacid?
a. H S c. HSO
b. H SO d. H S
____ 42. Selectthe correctformulaforsulfurhexafluoride.
a. S F c. F S
b. F SO d. SF
____ 43. What isthe correct name forthe compoundCoCl ?
a. cobalt(I) chlorate c. cobalt(II) chlorate
b. cobalt(I) chloride d. cobalt(II) chloride
____ 44. What isthe correct formulaforbariumchlorate?
a. Ba(ClO) c. Ba(ClO )
b. Ba(ClO ) d. BaCl
____ 45. What isthe correct formulaforcalciumdihydrogenphosphate?
a. CaH PO c. Ca(H PO )
b. Ca H PO d. Ca(H HPO )
____ 46. What doesan -ite or -ateendingina polyatomicionmean?
a. Oxygenisinthe formula. c. Nitrogenisinthe formula.
b. Sulfurisinthe formula. d. Bromine isinthe formula.
____ 47. Whichof the followingisthe correctname for N O ?
a. nitrousoxide c. nitrogendioxide
b. dinitrogenpentoxide d. nitrate oxide
____ 48. What isthe correct name forSn (PO ) ?
a. tritindiphosphate c. tin(III) phosphate
b. tin(II) phosphate d. tin(IV) phosphate
1) Which pair of elements is most apt to form a molecular compound with each
other?
A) aluminum, oxygen
B) magnesium, iodine

26. C) sulfur, fluorine
D) potassium, lithium
E) barium, bromine
2) Which of the following bonds would be best categorized as covalent?
I. H-S
II. Al-S
III. N-F
A) I only
B) II only
C) III only
D) I and III
E) I, II, and III
3) The substance below BEST characterized as having a high melting point and
able to conduct electricity in the liquid state only would be:
A) CH4
B) V2O5
C) CO
D) HF
E) C(diamond)
4) Which of the following would contain both covalent and ionic bonding?
A) CaO
B) NH3
C) C(diamond)
D) Ca(NO3)2
E) CO2
5) Rank the following bonds from most to least covalent in nature: (C-H, C-O, C-C,
Al-O)
A) C-H , C-O, Al-O, C-C
B) C-O, C-H, C-C, Al-O
C) C-C, C-H, Al-O, C-O
D) Al-O, C-O, C-H, C-C
E) C-C, C-H, C-O, Al-O
6) The correct name for SO is __________.
A) sulfur oxide

27. B) sulfur monoxide
C) sulfoxide
D) sulfate
E) sulfite
7) The correct name for CCl4 is __________.
A) carbon chloride
B) carbon tetrachlorate
C) carbon perchlorate
D) carbon tetrachloride
E) carbon chlorate
8) The correct name for N2O5 is __________.
A) nitrous oxide
B) nitrogen pentoxide
C) dinitrogen pentoxide
D) nitric oxide
E) nitrogen oxide
9) The name of PCl3 is __________.
A) potassium chloride
B) phosphorus trichloride
C) phosphorous(III) chloride
D) monophosphorous trichloride
E) trichloro potassium
10)The name of the binary compound N2O4 is __________.
A) nitrogen oxide
B) nitrous oxide
C) nitrogen(IV) oxide
D) dinitrogen tetroxide
E) oxygen nitride
11)Which of the following would be nitrogen monoxide?
A) NO
B) NO2
C) N2O
D) N2O3
E) N3O2
12)Which of the following is named INCORRECTLY?

28. I. CO - carbon(II)oxide
II. OF2 - difluorine oxide
III. H3P - trihydrogen phosphide
A) I only B) II only C) III only D) I and II E) I, II, and III
13)The correct name for H2O is __________.
A) hydrogen oxide
B) hydrogen(II) oxide
C) dihydrogen oxide
D) dihydrogen monoxide
E) hydrogen dioxide
14)The correct name for XeF4 is __________.
A) monoxenon pentafluoride
B) xenon pentafluoride
C) xenon tetrafluoride
D) monoxenon tetrafluoride
E) xenon fluorate
15)The correct name for P2O5 is __________.
A) phosphorus oxide
B) phosphorus pentoxide
C) diphosphorus oxide
D) phosphate
E) diphosphorus pentoxide
16)The name of BCl3 is __________.
A) boron chloride
B) boron trichloride
C) monoboron chloride
D) trichloro boron
E) monoboron trichloride
17)The name of the binary compound CS2 is __________.
A) carbon sulfide
B) monocarbon disulfide
C) carbon disulfide
D) carbon sulfate
E) carbon disulfate

29. 18)The only noble gas without eight valence electrons is __________.
A) Ar
B) Ne
C) He
D) Kr
E) All noble gases have eight valence electrons.
19)Which of the following would have all its valence electrons paired in its Lewis
structure representation?
A) Al
B) P
C) S
D) F
E) Xe
20)How many single covalent bonds must a silicon atom form to have a complete
octet in its valence shell?
A) 3
B) 4
C) 1
D) 2
E) 0
21)How many hydrogen atoms must bond to silicon to give it an octet of valence
electrons?
A) 1
B) 2
C) 3
D) 4
E) 5
22)Which of the following atoms is without lone electrons to be shared?
A) Al
B) Be
C) B
D) He
E) H
23)Of the following elements, which one will NOT be found as a diatomic molecule
in its elemental state?
A) Fluorine
B) Hydrogen
C) Oxygen
D) Sulfur
E) Chlorine