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7 Cards in this Set

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  • Back
Who first postulated the Atomic theory? What did he describe?
Democritus. He postulated that matter was comoosed fo atoms.
What is Daltons Law of Atomic Theory? 3 parts
1. Atoms are indestructible particles.
2. Elemental atoms have same mass and properties.
3. Atoms combine in whole number ratio to form compounds.
What is the nuclear therory of the atom?
1.Nucleus is postively charged and carries most of an atom's mass.
2. Mthe atom;s volume is mmost empty space
3. Proton are postively charged and nuetron are nuetral, they are in the nuclues. Electrons are negative,traveling outside the nuclues. Atoms are nuetral
What was the Rutherford experiment. What did it establish.
Rutherfor shot alpha particles thru a thin gold foil. Most passed thru, some deflected, some at sharp angles.

Proved the atoms was mostly empty space and the large mass of the atom was the nuclues and it was positvely charged.
What are protons?
Positively charged partice. Located in the nuclues.
Its mass is 1.67262 x 10-27 or 1.0073 amu
What are nuetrons? Charge? Mass? Location?
Nuetral particles. Found in the nucleus, it has about the same mass as the proton, 1.0087 amu or 1.67262 X 10 -27
where do non metals occur on the periodic table?