Presentation on theme: "Trends of the Periodic Table"— Presentation transcript:
1 Trends of the Periodic Table Representative elements (main group) only—so, transition and inner transition metals are not included in the trendsGroup/family: column of periodic tablePeriod: row of the periodic table
2 Atomic Radius: (atoms without charge) ½ the distance across atom Decreases left to right (across a period) because of the pull from the nucleus as the outer energy level fillsIncrease top to bottom (down a group) because of the additional energy level
3 Atomic Radius…examples What’s bigger?sodium or chlorine?hydrogen or potassium?What’s smaller?potassium or nickel?fluorine or bromine?
4 Ionization Energy: The energy required to remove the valence electron from an atom Increases left to right (across period) because the electron is closer to the nucleusDecrease going down a group because the electron is further from the nucleus
5 Ionization Energy…examples Which has a greater ionization energy?sodium or chlorine?hydrogen or potassium?Which has a smaller ionization energy?potassium or nickel?fluorine or bromine?
6 Electronegativity increases across a period Electronegativity: The ability of an atom to attract electrons in a chemical bondElectronegativity increases across a periodElectronegativity decreases down a groupH2.1Li1.0Be1.5B2.0C2.5N3.0O3.5F4.0Na0.9Mg1.2AlSi1.8PSClK0.8CaGa1.6GeAsSe2.4Br2.8RbSrIn1.7SnSb1.9TeICs0.7BaTlPbBi
7 Electronegativity…examples Which has a greater electronegativity?sodium or chlorine?hydrogen or potassium?Which has a smaller electronegativity?potassium or nickel?fluorine or bromine?