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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
