1. Part 1

2. Learning Objectives Identify the basic parts of an atom.
Describe the charge and location of protons, electrons and neutrons.

3. What are Atoms?
Positively charged protons and uncharged neutrons are bound together in a dense nucleus, while the negatively charged electrons move around the nucleus.
Atom – the smallest particle of matter. They make up everything around us.

4. Parts of an Atom Proton Neutron Electron - +
Positively charged protons and uncharged neutrons are bound together in a dense nucleus, while the negatively charged electrons move around the nucleus.

5. Parts of an Atom - Proton+ -
Proton – positively (+) charged atomic particles. Located in the nucleus of the atom.
Positively charged protons and uncharged neutrons are bound together in a dense nucleus, while the negatively charged electrons move around the nucleus.

6. Parts of an Atom - Neutron+ -
Neutron – uncharged (neutral) atomic particles. Located in the nucleus of the atom.
Positively charged protons and uncharged neutrons are bound together in a dense nucleus, while the negatively charged electrons move around the nucleus.

7. Parts of an Atom - Electron+ -
Electron – negatively (-) charged atomic particles. Located orbiting around the nucleus.
Positively charged protons and uncharged neutrons are bound together in a dense nucleus, while the negatively charged electrons move around the nucleus.

8. - + Charge and Location PROTON Nucleus NEUTRON NONE ELECTRON
PARTICLE
CHARGE
LOCATION
PROTON +
Nucleus
NEUTRON
NONE
ELECTRON -
Outside Nucleus
(in motion)

9. ELEMENTS
Elements are only one type of atom

10. MOLECULES
Molecules two or more atoms held together by chemical bonds.

11. COMPOUNDS
Compounds are made up of different types of atoms.

12. Molecules vs. Compounds
All compounds are molecules. Not all molecules are compounds.
Molecule
Not compound
Molecule
Compound

13. Stop Here

14. Part 2

15. Basic Atomic Structure Movie

16. Atomic Number 6 How many protons (red) are in this nucleus?
Atomic number = # of protons in the nucleus of an atom. It identifies the element.

17. Atomic Mass 12 What is the atomic mass of this atom?
Atomic mass = # of protons + neutrons.

18. Models of C, H, and O Atoms C, H and O are found in all living things.
Hydrogen Atom
Oxygen Atom
Carbon Atom
# of electrons = # of protons

19. Electron Shells
Electrons are arranged in energy levels or shells around the nucleus.

20. Valence Electron
Outer Shell
Electron from hydrogen
Electron from carbon
Valence Electron - an electron that can participate in the formation of a chemical bond.

21. Isotopes
Isotope - atoms of the same element that differ in their number of neutrons.

22. Stop Here

23. SUBATOMIC PARTICLES