Presentation on theme: "Bellringer Wed, 10/06 1.Please fill in the following missing letters in the pattern below… O T T F _ _ S U D T C _ _ S Reminders: LAB FEE NOW! HW #5 due."— Presentation transcript:
Bellringer Wed, 10/06 1.Please fill in the following missing letters in the pattern below… O T T F _ _ S U D T C _ _ S Reminders: LAB FEE NOW! HW #5 due Fri! FS CS One Two Three Four Five Six Seven Uno Dos Tres Cuatro Cinco Seis Siete
A happy atom must have… Number of p + = number of e -
What makes atoms different? What makes an atom unique is the number of protons in nucleus We know what element the atom is if we know the # of p+ in nucleus How do we know the number of protons? we look on the periodic table!
How to read element info! Element Symbol Atomic Number (#p + ) Mass Number (#p + + #n 0 ) Note: #n 0 = Mass Number - Atomic number
Atom + Atom Two or more atoms = molecule Element + element = compound All compounds have a formula (like a recipe! H 2 0, NaCl! Mixture: not chemically combined, can be separated (rice and corn) Solution: chemically combined, cannot separate physically (coffee, juice)