Back to the Basics The Periodic Table Why

Back to the Basics The Periodic Table

Why is it helpful? � Metal vs non-metal � Groups � Charges � Diatomic Elements � Molar Mass

Metals

Metals � Will always be the first part of an ionic compound � If in ionic form, will have a positive charge ◦ Ionic form means that it has lost electrons, making it a charged particle

Non-metals

Non-Metals � Will always be the second part of an ionic compound � If in ionic form, will have a negative charge ◦ Ionic form meaning it has gained electrons, making it a charged particle

Important Groups Group 1 – Alkali Metals

Important Groups Group 2 – Alkaline Earth Metals

Important Groups Transition Metals

Important Groups Group 3

Important Groups Group 7 - Halogens

Charges � Charged particles are called ions � Cations = positively charged particles ◦ Metals ◦ Ammonium ion � Anions = negatively charges particles ◦ Non-metals ◦ Rest of the polyatomic ions � We figure out charges based on how far the element is from a filled valance shell (closest noble gas in either direction)

Charges Ag+1 Zn+2 *transition metals, and group 4 can have multiple charges* +1 +2 +3 -3 -2 -1

Diatomic Elements There are 7 diatomic elements. We refer to them as Br I N Cl H O F. These

Molar Mass Molar mass is the mass of one mole of a substance. Units are either g/mol or amu. We use this number when converting between grams and moles