Atomic Properties and the Periodic Table

Metallic Property Trend  generally increases from top to bottom of the periodic table generally decreases from left to right Metals are found in the left hand side where as nonmetals are in the far right hand of the periodic table

B C N O F I Ar Kr Xe K Ca Rb Sr Cs Fr Si Cl Br Rn H Li Be Na Mg Al As He Ne Ar Kr Xe Rn H Li Be Na Mg K Ca Rb Sr Cs Ba Fr Ra B C N O F Al Si P S Cl Ge As Se Br Sb Te I Po At

Metals Non-metals 3 or less valence electrons Electron donor High densities and melting temperature Oxides are often soluble in acidic solution Good conductors Ductile and malleable Non-metals 5 or more valence electron Electron acceptor Low densities and melting points Oxides are soluble in basic solutions Poor conductors Not shiny,malleable and ductile

Atomic Size Trend Top to bottom increases Left to right decreases Reasons Due to additional energy level as you go down Due to increasing nuclear charge

Ionization Energy Amount of energy required to remove the electrons in an atom Trend top to bottom decreases  Left to right increases

Ionic Size When an atom combine with another atom to form cation, are always smaller than their atom Anions are always bigger than their atom Mg + O Mg2+ O2-

Classwork Using a periodic table, classify each element as metal or nonmetal Mg, K, Si, Br, Mn Arrange the following elements into increasing metallic property Ba, Sr, Be,Mg, Ca & Ra In each of the following sets, tell which will be the largest a) S, S2- b) Al, Al 3+ c) Ca, Ca2+, Se, Se2+ Arrange the following elements into decreasing ionization energy a) P, Si,Ar, Cl & Al b) Rb, K, Cs, Na, Fr, Li

Homework In each set which one has the highest ionization energy? He, Ne, Ar, Kr Mg, As, Al, F c) K, K+, Ca, Ca2+ Arrange the trends in atomic size in increasing order for the following ions: Be2+, Mg2+, Ca2+ & Sr2+

Additional Practice Arrange the succeeding elements according to increasing atomic size Ar, S2-, P3-, Mg2+ Answer the focus questions 3 through 6 on page