1. What does this mean???
Atomic mass
symbol
Atomic #

3. How do we define an element?
All elements have a symbol, atomic number and an atomic mass
The symbol is a shorthand way of writing the name
The atomic number places the element on the Periodic Table

4. Atomic Number = # of protons in an atom
How can we determine the atomic number of an atom?
Atomic Number = # of protons in an atom
# Protons ALWAYS = # Electrons!

5. 5

6. How can we calculate the total atomic mass of an atom?
Protons + Neutrons = Atomic Mass of an atom

7. Where do we find electrons in an atom?
Electrons are found orbiting or circling the nucleus in regions
called electron clouds.

8. So….Why do you think the number of protons always equals the number of electrons?
Because it helps keep the atom __________

9. Decoding the P.T.
The atomic number is also equal to the total number of protons
The total number of electrons is always equal to the number of protons
The atomic mass is the number of protons plus the number of neutrons

10. How is matter found? Matter can be found three ways: Single Elements
Compounds
Mixtures 10

11. A compound is two or more elements chemically combined
A compound is two or more elements chemically combined. It is the SAME THROUGHOUT!
A mixture is two or more different substances physically placed together. It can be physically taken apart!

12. Compound facts! Compounds have a single formula
NaCl = Sodium Chloride = Salt!!!!
Compounds cannot be separated physically
You cannot take the Na away from the Cl with your hands!!!!!
The number below (subscript) an element in the formula is the number of atoms of that element
H2O = 2 atoms of H and 1 atom of O 12

13. What is a mixture?
A mixture is two or more substances physically combined
The substances will keep their own properties 13

14. Two types of mixtures
What could you be drinking that would be the same color throughout and taste the same every time you take a sip??
Homogeneous: the mixture is the same throughout. (Though not mixtures, elements and compounds are also homogeneous)
Heterogeneous: the mixture varies from one portion to another 14

15. What’s the solution? A solution is the same throughout
It is formed when a soluble (solid, liquid or gas) substance dissolves into another
A solution is transparent which means you can see through it
If a substance does NOT dissolve it is said to be insoluble 15

16. What are the two parts?
The two parts of a solution are the solute and solvent
The solute is the substance being dissolved or the substance that disappears
The solvent is the substance that dissolves the solute. 16