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23 Cards in this Set

  • Front
  • Back
What are four fundamental elements?
Air; Earth; Fire; Water
What is the smallest particle of matter?
Atom
The idea that matter is made of fundamental particles called atoms is know as what?
Atomic Theory
What did Lavoiser concluded?
He concluded that when a chemical reactions occurs, matter is niether created nor destroyed but only changed.
What was lavoiser conlusion became known as?
His conclusion became known as Laws of Conservation Matter or Mass.
What is Law of Definite Porportion?
Is when elements that compose the compounds are always in a certain porportion by mass.
What is all matter made of?
Atoms
Can atoms be divided into smaller particles?
NO
What is a hypothesis?
A hypothesis is a testable prediction to explain the observations.
What is a theory?
A explanation based on many observations and supported by many results of investigations.
What is a summarized systematic approach used to answer questions and solve problems?
Scientific Method
What is a Scientific Law?
The fact of nature that is observed so often that it becomes accepted as the truth.
What is a negatively charged particle?
Electron
What is a a positively charged subtomic particle?
Proton
What two subtomic particles are equal but are oppisites?
Electron and Protons
What are atoms of an element that are chemically alike but differ in mass?
Isotopes
What is a nuetral particle?
Nuetron
What is a small, dense, postively charged Central Core?
Nucleus
Atomic Number
The number of protons in the nucleus of an atom of that element. Top Right Corner.
Mass Number
The sum of protons and nuetrons
Energy Level
The region of space in which electrons move about the nucleus.
Electron Cloud
The space around a nucleus of an atom were the electrons are most likely to be found.
What are the electrons in the outermost energy level?
Valence Electrons