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Atoms- E.L
Important words in the unit about Atoms
11
Science
8th Grade
10/03/2012
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Term
Democritus
 Definition
He developed the idea about atoms- a particle that cannot be cut
Term
John Dalton
 Definition

His theory stated three ideas:

1)All substances are made of atoms. Atoms are small particles that cannot be created, divided, or destroyed.

2)Atoms of the same element are exactly alike, and atoms of different elements are different.

3) Atoms join with other atoms to make new substances.

 
Term
Joseph Thompson
 Definition
Discovered electrons- a smaller negative charge
Term
Nucleus
 Definition
Extremely dense, center of atom, positively charged
Term
Electron cloud
 Definition
PLace in the atom where electrons are likely to be found
Term
Atoma
 Definition
greek word for indivisible- this is what Democritus called atoms
Term
Niels Bohr
 Definition
Said that electrons were in orbits containing a certain amount of electrons in each orbit.
Term
Particle
 Definition
All atoms are made of smaller parts called particles
Term
Proton
 Definition
Positively charged and has mass
Term
Neutron
 Definition
No electrical charge and has mass
Term
Electron
 Definition
Negatively charged- very little mass
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