Atoms and atomic theory

Atoms and Atomic Theory

Essential Questions: How and why has the Atomic Theory changed over time? How can we describe the molecular motion of the states of matter?

Bellwork

Chemical Property Physical Property

Reactivity Cconductivity

Flamibility Density

Specific Heat Ductility

Magnetism

Malleability

Bellwork0Place the Atomic Theory Cards in

order.0 Fill in this chart in your notebook.

Dalton’s Atomic Theory Facts

Explain why you placed these facts in this order. What is your evidence?

Dalton’s Atomic Theory

Atoms are tiny, invisible particles. Atoms of different elements are

different Compounds are formed by combining

atoms. Atoms of one element are the same.

Atomic Theory

Title your page:

TIMELINE

Cut out the atomic models and the words.Match the model to the explanations.DO NOT GLUE!

Atomic Theory Timeline

Scientist Information Model

John Dalton

Matter is formed of small pieces that could not be cut into smaller parts called “atomos” meaning uncuttable.

J.J Thompson

Atoms are made mostly out of (+) charged materials, like dough in a bun. The (-) charged electrons are found inside the (+) dough.

Ernest Rutherford

Atoms have (+) particles in the center, and are mostly empty space. (+) particles called protons, the center of atoms called the nucleus.

Neils Bohr

Improved on Rutherford’s model. He proposed that electrons move around the nucleus in specific layers, or shells. Every atom has a specific number of electron shells.

James Chadwick

Worked with Rutherford to discover particles with no charge – called neutrons. Neutrons are also found in the nucleus.

NEUTRONS

Atomic TheoryChanges over time…

Because Scientific evidence gathered from experiments gave scientists a better understanding of atoms

Think-Pair-Share!

Take a minute to read the essential question as I read it aloud: “How and why has the Atomic Theory changed over time?”After you have jotted down your notes in the space on your guided notes, exchange your thoughts with your partner. We will have share-outs and discuss the answer.

http://www.brainpop.com/science/matterandchemistry/atomicmodel/

Atoms and Atomic Theory

Essential Questions: How and why has the Atomic Theory changed over time? How can we describe the molecular motion of the states of matter?

Three states of matter

solid liquid gas

At room temperature most substances exist in one of three physical states.

Solids0 The particles in a solid are very tightly packed and

vibrate in place. 0 Solids have a definite volume and shape.

Particles in a solid – animation

Liquids0 The particles in a liquid are close together but can

move and flow past one another.0 Liquids have a definite volume but they do not have a

definite shape. This is why liquids like water take the shape of the container they are in.

Picture was taken at the exact moment these water balloons were popped!

Particles in a liquid – animation

Gases0 Particles in a gas have higher amounts of energy than

those in a solid or liquid. 0 Gases do not have a definite shape or volume. When

placed in a container, it fills up the entire container and spreads out as far as possible.

Particles in a gas – animation

Molecular MotionAdding heat

Removing heat

In your groups, you will rotate clockwise after 4 minutes through the 5 stations. You will write all information on the Gallery Walk handout.

Stay with your group at all times. Do not move ahead or go back, wait for the timer to move. You may discuss possible answers with your group

members. Raise your hand if you need assistance after you have

asked your group members.

Independent Practice

Atoms and atomic theory

Education

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