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Recognize that all matter consists of atoms.

Recognize that all matter consists of atoms.

Key concepts/skills:Level 1: Define key vocabulary. Describe the basic structure of an atom.

Level 2: Explain Dalton's Atomic Theory. Describe how all matter is made up of atoms.

Level 3: Calculate mass number, atomic number, number of protons, neutrons or electrons. Explain how the same element can have different isotopes.

• Key vocabulary:• matter• atom• mass number• mass• proton• atomic number• volume• neutron • isotope• atomic theory• energy levels

Recognize that all matter consists of atoms.

Recognize that all matter consists of atoms.

I.Dalton’s Atomic theoryA.1803 John Dalton came up with his atomic theory

1.All substances are made up of atoms and atoms cannot be divided.2.Atoms of the same element are exactly alike.3.Atoms join with other atoms to make new substances.

Recognize that all matter consists of atoms.

A.Now we know (Modern atomic theory)1. All matter is made up of atoms2. Atoms can be divided (fission)3. Atoms of the same element can be different

(isotopes) different versions of the same element4. Atoms of different elements are different5. Atoms combine to form compounds

Recognize that all matter consists of atoms.

II. Structure of the atomA.Nucleus

1.Protons - + charges particles make up the nucleus

2.Neutrons – neutral particles make up the nucleus

B.Electrons1.Negatively charged particles that orbit around

the nucleus

III. Drawing an AtomA.Atomic number – the least of the two numbers/ tells

the number of protons the atom has

B.Mass number - the greatest of the two numbers/ is the sum of protons plus neutrons

1.If you subtract the atomic number from the mass number you get the number of neutrons in the atom

Recognize that all matter consists of atoms.

Recognize that all matter consists of atoms.

A.Drawing electrons1.Electrons travel in definite energy levels

2.1st level holds 2 e-, 2nd level holds 8 e-, 3rd level holds 18 e-

3.When drawings electron, you fill 1st with 2 e- then fill the second and so on

1.Matter

Matter is anything that has mass and

volume

2. Mass

The amount of matter in an object

Volume

Volume is the amount of space

an object takes up

Other Related Terms

Isotopes1.Isotopes are different version of the same element

2. The only thing that changes is the number of NEUTRONS

Atoms areToo small to see!