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Chem Test Atoms

11/18/25

QuestionAnswer
atom smallest particle of an element
mass number total number of protons and neutrons
isotope atoms with same number of protons but different number of neutrons
electron negatively charged subatomic particle
neutron subatomic particle with no charge
proton positively charged subatomic particle
scanning tunneling microscope instrument allowing atoms to be seen
atomic number the number of protons in the nucleus of an atom of that element
radioactive rays and particles emitted
atomic mass unit defined as 1/2 the mass of a carbon-12 atom
* know how to read the periodic table .
List Dalton's 5 parts of his atomic theory All matter is made of atoms Atoms are indivisible & indestructible Atoms of a given element are identical in size, mass, & properties Atoms of a specific element are different from those of another element Different atoms combine to form compounds
Last part of Dalton's theory (the 6th one) (it wouldn't all fit in the other box) In a reaction, atoms are separated, combined, or rearranged
Democritus ( for the people, know the name, date, and what they did) 400 BCE Said atoms were invisible, indestructible, fundamental units of matter
John Dalton 1803 Came up with the atomic theory
JJ Thomson 1897 Discovered electrons by the use of Cathode ray and came up with the plum pudding model
Ernest Rutherford 1911 Discover nucleus using gold foil experiment
Rutherford 1920 Discovers the proton using alpha particles (positive charge)
James Chadwick 1932 Discovers the neutron
Millikan 1909 oil drop experiment and discovered change of the electron
Created by: user-1777988
 

 



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