Bellringer Wed, 10/061. 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!

F S

C S

One Two Three Four Five Six Seven

Uno Dos Tres Cuatro Cinco Seis Siete

Brief Intro to Chemistry

What is everything made of?

• Everything is made of matter

• Matter is found as elements

• Elements are organized on the Periodic Table

• They are made of atoms

What is an atom?

• Smallest unit of matter!

• Everything is made of atoms.

Parts of an atom

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+ + #n0)

Note: #n0 = Mass Number - Atomic number

So what does it look like?

Atom + Atom• Two or more atoms = molecule

• Element + element = compound

• All compounds have a formula (like a recipe! H20, NaCl!

• Mixture: not chemically combined, can be separated (rice and corn)

• Solution: chemically combined, cannot separate physically (coffee, juice)