Science review. Who created the Atomic Theory? John DaltonJohn Dalton.

Science reviewScience review

Who created the Who created the Atomic Theory?Atomic Theory?

•John DaltonJohn Dalton

What did it say?What did it say?

• That all matter is made That all matter is made up of tiny particles up of tiny particles called atomscalled atoms

What is an atom What is an atom composed of?composed of?

• ProtonsProtons

• NeutronsNeutrons

• ElectronsElectrons

These are also These are also called?called?

•Subatomic Subatomic particlesparticles

What charge does What charge does an electron have?an electron have?

•negativenegative

What charge does a What charge does a proton have?proton have?

•positivepositive

What charge does a What charge does a neutron have?neutron have?

•NeutralNeutral

Electrons move in a path called ….

•orbits

These are also called ….

•Energy levels

High energy electrons are

(closer or further) away.

•further

Which subatomic particle has more

mass?•protons

How much?

•About 2,000 times

If the atom has the same amount of

protons and electrons, what is it

called?

•A neutral atom

What is a substance made up of only one kind of atom?

•element

What is an atom?

•The smallest unit of an element that has all the properties of that element

How do you determine the

atomic number of an element?

•The number of protons in one atom

In pure form, what state are most

elements found at room temperature?

•solid

What are the two liquids?

•Mercury & bromine

What is a molecule?

•Two or more atoms linked together

What is luster?

•shininess

What type of luster do most metals have?

•Silver, gray

What is malleable?

•To be hammered or rolled into thin sheets

What is ductile?

•Be able to be formed into wires

What is special about metal electrons?

They are free to move to other metal atoms

Why is metal not used on pot

handles?•Metals conduct heat

Describe an insulator

•Material that does not conduct electricity well

What makes a good insulator?

•The electrons are bound tightly to their atoms

What is an alloy?

•A mixture of different metals

The End