CHEMISTRY CATALYSTS Fall 2011 – Week 11 (Periodic Table)

Catalyst (5 min)  10/16/12 Periodic Trends  EQ: What happens to atomic & ionic radii when you move across periods & down groups? 1. List other elements in the same period as Na. What do these elements have in common? 2. List other elements in the same group as Na. What do these elements have in common? Mg, Al, Si, P, S, Cl, Ar  Same energy levels Li, K, Rb, Cs, Fr  1 + charge, reactive, 1 valence e -, gray metals

Atomic radius  Unlike a ball, an atom has fuzzy edges.  The radius of an atom can only be found by measuring the distance between the nuclei of two touching atoms, and then dividing that distance by two.

Ionic radius  For an ionic radius, the distance between the nuclei of a bonded cation (+ ion) and anion (- ion) is used.  You must know the radius of the other ion to determine it. Oxide is generally used.

Catalyst (5 min)  10/18/11 Periodic Trends  EQ: What happens to electronegativity & ionization energy as you go down a group & across a period?  Use your data from yesterday to answer:  Which is bigger, Na or Cl? Explain your answer.  Which is bigger, Na + or Cl - ? Explain your answer.

Ionization Energy  Energy required to remove an electron from an atom  Which atom would be harder to remove an electron from? Na Cl

Electronegativity  Tendency of an atom to attract electrons  Which atom would attract electrons more strongly? Na Cl

Catalyst (5 min)  10/19/11 Periodic Trends  EQ: What trends exist as you go across a period or down a group?  What is a trend? What examples of trends can you think of in your life?  How does the activity we did Monday & Tuesday relate to trends?

Electronegativity Atomic Radius Ionization Energy F is highest Fr is lowest He is highest Fr is lowest Fr is largest He is smallest

Catalyst (5 min)  10/20 /11 Periodic Trends  EQ: How can I use periodic trends to make predictions?  Compare the elements Ca and Se. 1. Which has the biggest atomic radius? 2. Which has the biggest ionic radius? 3. Which has the highest ionization energy? 4. Which has the highest electronegativity? Ca Se

Writing Electron Configurations s d f p

H He LiBe BC NOFNe NaMg AlSiPSClAr KCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr RbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXe CsBa HfTaWReOsIrPtAuHgTlPbBiPoAtRn FrRa RfDbSgBhHsMtDsRgCn UutUuqUupUuhUusUuo Lanthanides LaCePrNdPmSmEuGdTbDyHoErTmYbLu Actinides AcThPaUNpPuAmCmBkCfEsFmMdNoLr Alkali Metals Alkaline Earth Metals Transition Metals Halogens Noble Gases Lanthanides Actinides