Lowell High School Chemistry
Lewis Dot Structures Practice Handout — due Wednesday, September 26, 2007
Directions: Answer all questions on a separate sheet of paper. Staple this to your answer sheet.
[1] What is the difference between an anion and a cation?
[2] What is the difference between an ionic bond and a covalent bond?
[3] Define: valence electron, electron dot symbol.
[4] What is the octet rule? Explain its role in bonding between atoms.
[5] Explain why ionic compounds are electrically neutral.
[6] Draw the Lewis electron dot structures of the following atoms:
[a] Ca [b] K [c] Cl [d] Al [e] Kr [f] P
[7] Indicate how many electrons must be gained or lost by each of the following atoms to achieve a stable electron configuration, e.g. lose 3, gain 2, etc.? [Hint: Which group on the periodic table contains elements with a stable electron configuration?]
[a] Ca [b] K [c] Cl [d] Al [e] Kr [f] P
[8] Which of the following pairs of elements will or will not form ionic compounds? Explain why for each.
[a] sulfur and xenon
[b] sodium and calcium
[c] strontium and sulfur
[d] selenium and chlorine
[9] Draw the Lewis dot structures of the following compounds:
[a] sodium chloride (NaCl)
[b] hydrogen peroxide (H2O2)
[c] iodine gas (I2)
[d] carbon tetrafluoride (CF4)
[e] hexane (C6H14)
[f] hexene (C6H12)
[g] calcium sulfide (CaS)
[h] hydrogen cyanide (HCN)
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