Trends in Metal and Nonmetal Reactivity 2016.notebook January 06, 2017 DO NOW 1.) Which element is considered malleable? A) Gold B) Hydrogen C) Sulfur D) Radon 2.) Which element has the most occupied principle energy levels? A) C B) Cl C) Kr D) He 3.) Which element is non­reactive? Why? A) K B) Na C) F D) Ne Nov 15­3:07 PM Periodic Trends Aim: Reactivity of metals and nonmetals. Nov 15­3:07 PM 1 Trends in Metal and Nonmetal Reactivity 2016.notebook January 06, 2017 Metallic and Nonmetallic Character The most metallic elements are in the bottom left hand corner of the periodic table. The most nonmetallic elements are in the top right hand corner of the periodic table. Nov 17­2:58 PM Reactivity Trends Metal reactivity increases down a group because as nuclear shielding increases and the nucleus' hold on the valence electron weakens, therefore it is easier to remove valence electrons. Nonmetal reactivity decreases down a group because the nucleus' ability to gain more valence electrons weakens due to more nuclear shielding. Nov 17­2:58 PM 2 Trends in Metal and Nonmetal Reactivity 2016.notebook January 06, 2017 Metal Reactivity For Metals: the most reactive metals are those that can lose their valence electrons the most easily. Francium has the lowest electronegativity and the largest atomic radius therefore it is very easy to remove it's valence electron. Francium is the most reactive metal. Nov 17­2:52 PM Nonmetal Reactivity The most reactive nonmetals are those that can most easily gain valence electrons. Fluorine has the highest electronegativity and the smallest atomic radius therefore it gains valence electrons the most easily. Fluorine is the most reactive nonmetal. Nov 17­2:54 PM 3 Trends in Metal and Nonmetal Reactivity 2016.notebook January 06, 2017 Reactivity of metals https://www.youtube.com/watch?v=uixxJtJPVXk&feature=youtu.be Nov 17­2:58 PM Why don't the noble gases have electronegativity values and the largest first ionization energies? Nov 17­2:58 PM 4 Attachments Experiment lithium.asf Experiment potassium.asf Experiment cesium.asf.