Just how small is an atom? https://www.youtube.com/watch?v=yQP4UJhNn0I

Basic Parts of an Atom, Basic Parts of the Atom - Protons, Neutrons, Electrons, Nucleus - YouTube

Modeling Atoms How are atoms of elements different from one another? How does this explain why the periodic table looks the way it does?

Rules! Protons – positive Electrons – negative Neutrons – no charge (electrically neutral) ATOMIC NUMBER – ALWAYS TELLS YOU HOW MANY PROTONS ARE IN THE CENTER OF A GIVE ATOM. Find the atomic number of Carbon – put your finger on it! Find the atomic number of Oxygen - put your finger on it!

ZERO ELECTRIC CHARGE 1 proton + and 1 electron – balance each other out so…… Electrically balanced So the number of protons and electrons equal each other

How to determine the number of neutrons

Shells K Shell – 2 electrons L Shell – 8 electrons M Shell – 18 electrons

Hydrogen H chemical symbol Colorless, odorless, tasteless gas Explosive Atomic number = Number of Protons = Number of electrons Atomic mass = Number of neutrons = (Atomic Mass – Atomic number)

Helium Atomic number = Number of Protons = Number of electrons = Atomic mass = Number of neutrons = (Atomic Mass – Atomic number)

Lithium Atomic number = Number of Protons = Number of electrons = Atomic mass = Number of neutrons = (Atomic Mass – Atomic number)

Beryllium What is the atomic number of Beryllium? Light silvery metal Used in steel making

Boron

What element is next? All life on Earth is carbon-based. Solid, black Fossil fuels – coal, oil, natural Gas are combinations of Hydrogen and Carbon Carbohydrates – foods we eat

Nitrogen Colorless, odorless gas that makes up 78 % of the air we breathe. What are the differences in the properties of gas and carbon? How are the two atoms different

As the number of protons changes so do the physical and chemical properties!

Neon – A Noble Gas What do you notice about neon’s outershell? Neon is an inert gas – it does not react or combine with any other element. Why do you think that is true!