1. Parts of the Atom What do the numbers mean?
Atomic Structure
Parts of the Atom
What do the numbers mean?

2. Learning Targets: I can arrange the atomic particles by size (DOK 1)
I recognize the significance of the number of protons in an atom and how that number relates to the identity of the atom (DOK 1)
I can relate the atomic number of an atom to the number of electrons in a neutral atom (DOK 2)
I can explain and interpret the numbers and symbols on the periodic table (DOK 1 and DOK 3)

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

4. 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

5. What makes up the subatomic particles?
What is the smallest thing on earth? Please click on the above link to watch the video.

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

7. 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

8. Recognizing Atomic Numbers:
Element
Atomic Number
Lithium (Li)
Sulfur (S) 8
Carbon (C) 11

9. Atomic Number Practice:
Element
Atomic Number
# of Protons
# of Electrons
Nitrogen 17 10 8 6

10. 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

11. Atomic Mass: Mass # = p+ + n0
Atomic Mass: Mass # = p+ + n0 *plug in what you know, and you can determine the mass, the number of neutrons, the number of protons, or the element.
Element
# of protons
# of neutrons
# of electrons
Mass #
Oxygen 8 16
Arsenic 33 42 75
Phosphorous 15 31

12. Complete this chart in your notes:
Element
# of Protons
# of Electrons
Atomic #
Atomic Mass
# of Neutrons
Carbon 6 12
Sulfur 16
Sodium 11 79 27 14
Helium (He) 4 20
Polonium (stable) 84
Lead 82

13. Check your work: Element # of Protons # of Electrons Atomic #
Atomic Mass
# of neutrons
Carbon 6 12
Sulfur 16 32
Sodium 11 23
Gold (Au) 79
197
118
Aluminum 13 27 14
Helium 2 4
Calcium 20 40
Polonium (Stable) 84
209
125
Lead 82
207