Lesson 3: Atoms Flashcards
(24 cards)
he developed a theory to explain why the elements in a compound always join in the same way
John Dalton
proposed explanation describing the behavior of matter
John Dalton
what law is this: atoms are neither created nor destroyed in any chemical reaection
Law of Conservation of Matter
what law is this: atoms are separate, join or rearrange during a chemical reaction but remain unchanged. Therefore, there will be no change in mass
Law of Conservation of Mass
what law is this: atoms of different elements can physically mix together of chemically combine with one another in single whole number ratios to form compounds
Law of Definite Compositions
what model did John Dalton propose in 1804?
The Billiard Ball Model
who discovered the electron in 1897
J.J. Thomson
what experiment was used to discover the electron
cathode ray experiment
what model did J.J. Thomson propose
Plum Pudding model in 1904
he discovered isotopes in 1913
J.J. Thomson
glowing beams of light that follow an electrical discharge inside a high-vacuum tube
cathodes
negative terminal
cathodes
positive terminal
anodes
who discovered the nucleus
Ernest Rutherford
alpha particle gold-foil experiment
Ernest Rutherford
what does rutherford’s model state
that all of an atom’s positive charge is concentrated in its nucleus
where is most of the atoms mass
the nucleus
what is the smallest unit of positive charge in the nucleus that J.J. Thompson coined the word for
Proton
what is rutherford’s model patterned after
the solar system
who discovered the neutron
James Chadwick
how was the neutron discovered
James Chadwick believed that the positive particles would push each other away if there was no neutral charge to separate them
who discovered the proton
Eugen Goldstein, Anode Rays
every element has a unique atomic ______, determined by the proton
atomic number
how are compounds formed
bonds caused by electrons moving between atoms
