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Science
Test
15
Science
8th Grade
10/15/2013

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Cards

Term
What is a familiar idea used to explain unfamiliar facts and observed in nature?
Definition
Model
Term
What is a an explination of observable facts and phenomena?
Definition
Theory
Term
What is proposed the existance of an atom?
Definition
Democritus
Term
What was rejected the idea of an atom?
Definition
Aristotle
Term
Who was credited with discovery of the electron?
Definition
J.J. Thomson
Term
What are particles in the nucleus of the atom?
Definition
Nucleons
Term
What is a number of protons in the nucleus of an atom?
Definition
Atomic Number
Term
What is a number of protons (+)=# of electrons (-)
Definition
Neutral Atom
Term
What are atoms of an element that have different numbers of neutrons?
Definition
Isotopes
Term
What is a total number of protons and neutrons in an atom?
Definition
Mass Number
Term
What is an average of the masses of all the element's isotopes?
Definition
Atomic Mass
Term
Who was an English schoolmaster who explained who explained "The Law of Conservation of Mass."
Definition
John Dalton
Term
What must models and theorys do?
Definition
1. Explain all known facts
2. Enable scientist to make correct predictions
Term
What is comprised by protons and neutrons in an atom?
Definition
Necleons
Term
Atoms are what because the number of poitively charged protons equals the number of negitively charged electrons?
Definition
Neutral
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