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Chapter 4 Section 1-2
Chem 4.1&4.2
11
Chemistry
10th Grade
09/21/2010

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Term
Atom
Definition
the smallest particle of an element that retains its identity in a chemical reaction
Term
Democritus
Definition
460 BC- was among the first to suggest the existence of atoms.
Term
Thomas Dalton
Definition
1766-1844)- an English Chemist and schoolteacher. Studied the ratios in which elements combine in chemical reactions
Term
J.J. Thompson
Definition
1856-1940)- discovered the electron
Term
Electron
Definition
Negatively charged subatomic particles 
Term
Cathode Ray
Definition
Glowing beam
Term
Robert A Millikan
Definition
(1868-1953)-carried out experiments to find the quantity of charge carried out by an electron.
Term
Protons
Definition
Positively charged subatomic particles 
Term
Neutrons
Definition
Subatomic particles with no charge but with a mass nearly equal to that of a proton
Term
Nucleus
Definition
The central core of an atom... has protons and neutrons 
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