Presentation on theme: "Kayla McAuley. Chemical Reactivity Some elements are highly reactive while others arent A chemical reaction: A transformation resulting in a change."— Presentation transcript:
Chemical Reactivity Some elements are highly reactive while others arent A chemical reaction: A transformation resulting in a change of composition, constitution and/or configuration of a compound ( referred to as the reactant or substrate )- http://www2.chemistry.msu.edu/faculty/reus ch/VirtTxtJml/react1.htm
Noble Gases Are The Least Reactive Elements Group 18 in periodic table They show almost no activity because there stable ! Meaning they have all of there electrons in there outer shell These gases are helium, neon, argon, krypton, xenon, & radon
Alkali Metals & Halogens Are Most Reactive Elements Because of the octet rule, an atom whose outer s & p orbital's do not match the electron configurations of a noble gas will react to lose or gain electrons so outer orbital's will be full
Words To Know !!! Ion : an atom, radical, or molecule that has gained or lost one or more electrons an has a negative or positive charge Cation : an ion that has a positive charge Anion : an ion that has a negative charge
Did You Know ? Many atoms form stable ions have noble-gas configurations ! Helium is an exception from the rule … it only has 2 !