1. 1.WHAT IS AN ATOM everything is made of atoms
Smallest part of an element that has all of properties of that element
Very small, six sextillion in a drop of water
Different kinds are listed on the periodic table

2. 2.What is inside an atom Location In nucleus In cloud nn
Subatomic particles called protons, neutrons and electrons. Are there smaller things? Yep! nn
Location
In nucleus
In cloud

3. Example Lithium

4. 3. How can you tell how many particles each atom has
3. How can you tell how many particles each atom has? Use Periodic Table
Atomic Number (Z) is the number of protons (decides what atom it is) It is also the number of electrons for a neutral atom.
Mass Number (A) is the number of protons plus the number of neutrons
So A-Z=Neutrons(Round off atomic mass to get common mass number)
Atomic Mass- the average mass of an elements atoms
Ex) some Hydrogen atoms have more neutrons than others

5. For example, Fluorine has: 9 protons 9 electrons 10 neutrons most of the time (protons + neutrons = mass number