Reactivity Notes Page 33 Reactivity Notes Essential Question

Reactivity Notes

Page 33: Reactivity Notes • Essential Question: How do you determine the reactivity of an element?

Reactivity Notes • Valence Electron: Valence Electrons are the electrons in the outermost (last) shell/energy level • Valence Electrons determine the reactivity of an atom/if an atom will form bonds

How do you find Valence Electrons? • LOOK AT THE GROUP NUMBER: – Group 1: 1 ve – Group 2: 2 ve – Group 13: 3 ve – Group 14: 4 ve – Group 15: 5 ve – Group 16: 6 ve – Group 17: 7 ve – Group 18: 8 ve

Reactivity • An atom’s goal is to get to 8 valence electrons —that is when it is happiest – Can gain, lose, or share valence electrons

Reactivity and Groups • Alkali Metals (group 1) are the MOST reactive— they give up their 1 valence electron easily • Alkaline Earth Metals: very reactive—they give up their 2 valence electrons • Halogens: most reactive nonmetal group—They love to gain 1 valence electron • Noble Gases: they are the least reactive group (they are stable)—they already have 8 valence electrons so they are

Lewis Dot Structures (Honors) • Lewis Dot structures show the valence electrons of an element • Cut out the diagram from page 85 of your book—the pages should be in your folder form last weeks reading.

Summary Valence electrons determine an element’s ability to ____________. Elements will _____, or share electrons to get ______valence electrons.