1. 10 Cornell Notes: Atoms and Elements GOALS
I can explain the difference between the mass number and the atomic number of an element.
I can use the periodic table as a tool.
I can explain the difference between a molecule, element and a compound. 10

2. Atoms and Elements Notes
What are atoms?
Building blocks of ALL matter.
What is matter?
Anything that has mass and takes up space.
(solid, liquid, gas)
*Atoms for the most part want to be neutral.

3. O = O = H O , 0 = H O , NaCl H + H + 0 , O + O O + O
The smallest unit of an element
Atom
O =
Element
(molecule)
Two or more atoms that are chemically joined together (can only contain one type of atom). 2
O + O
H O , 0 =
Molecule
A basic substance that can’t be simplified.
H + H + 0 , O + O
H O , NaCl 2
A molecule that contains more than one type of element
Compound

4. C 6 12 Atomic Mass Number Atomic Number
Element:
Type of matter made of only one type of atom. C 6 12
Atomic Mass Number
“The number of protons + neutrons in a nucleus”.
Atomic Number
The number of protons the atom has in its nucleus.
Carbon
Atomic Symbol

5. I can use the periodic table as a tool.6