1. How small is an atom? Parts of the Atom What do the numbers mean?
Atomic Structure
How small is an atom?
Parts of the Atom
What do the numbers mean?

2. Atomic Particles Particle Charge Mass # Location Electron -1
Electron Cloud
Proton +1 1
Nucleus
Neutron

3. What is an atom made up of?
Atomic Particles:
Proton
Identifier for the atom, keeps electrons attached to the atom
Slightly smaller than the neutron
Neutron
Stabilize the atom
Slightly larger than the proton
Electron
Allowing for atoms to bond to other atoms
Smallest of the 3 subatomic particles

4. What do the numbers and letters on the periodic table mean?
Atomic Number Atomic Symbol Element Name Atomic Mass

5. Atomic Number
This is the number of protons in the nucleus, of an atom…. ALWAYS!
Think of it like an atom’s DNA
It is what makes an element an element
It also tells you how many electrons are in a STABLE atom.
Protons = electrons in stable atoms
ATOMIC NUMBER

6. Atomic Mass
Is the number of protons PLUS the number of neutrons in the nucleus of an atom.
Unit is Atomic Mass Units (AMU’s)
Atomic Mass