The Atom Atomic Clock Atom Bomb Atom Ant

What Do You Think? Draw a diagram of what you think an atom looks like. Are atoms mostly – Empty space – Stuff – Equal parts of each

Challenge Question Atoms are mostly … ______________________________________

Challenge Question What are atoms mostly made of? a.Protons b.Neutrons c.Electrons d.Equal parts of all three e.Empty space

Connection If an atom had 11 protons, how many electrons does it have? How do you know?

Vocabulary Define in words, diagrams or both Proton Neutron Electron Nucleus Electron cloud Charge Element atom Check Quizlet – I have made this set for you. Quizlet

Resources (places to look for information) Bill Nye – Holt Physical Science Text, pages Sciencesaurus Text, pages Chem4Kids- The Atom PowerPoint – (see Science Website)

ObjectiveNotes Describe what an atom is Describe an element Describe the subatomic particles that make up atoms Describe how atoms are put together ParticleLocationChargeMassOther

Parts of an Atom Notes

First off, what is an atom? Atoms are the smallest parts to which an element can be divided yet still be that element. Atoms are the building blocks of all matter.

Describe an element A substance made up of only one kind of atom

How small is an atom? An atom is so small that a penny contains about 2 x or 20,000,000,000,000,000,000,000 atoms!!!

But there’s more… Atoms consist of even smaller particles. These include: – Protons – Neutrons – Electrons

The Nucleus The center of an atom Small, dense (packed tightly) Contains protons and neutrons: most of the atom’s mass So dense, if it were the size of a grape, it would weigh over 9 million tons!

Protons Located in the nucleus Positive charge (+) Mass of 1 atomic mass unit (amu) protons = positive

Neutrons Located in the nucleus Have no charge - neutral Mass of 1 amu neutrons = neutral

Electrons Found outside of the nucleus in electron clouds – (think of rings around a target) Negatively charged (-) Mass of almost zero Number of electrons equals the numbers of protons to cancel out the charges – (think of -1+1=0) electrons = negative

How Atoms Are Put Together The protons and neutrons make up the center or nucleus.

ObjectiveNotes Describe what an atom is Atoms are the smallest parts to which an elements can be divided yet still be that element. Describe an element A substance made up of only one kind of atom Describe the subatomic particles that make up atoms Describe how atoms are put together Protons and neutrons packed tightly in the small dense nucleus (center). Electrons (with nearly no mass) zip around the nucleus in a region called the electron cloud. The electron cloud region of the atom is mostly empty space because it encompasses such a large area of the atom – atoms are mostly empty space ParticleLocationChargeMassOther Protonnucleus+1 amu Neutronnucleusnone1 amu electronElectron cloud -Almost zero Number of electrons equals the numbers of protons to cancel out the charges (think of 1+1=0)