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chapter 4 chemistry

dalton's atomic theory dalton formulated hypotheses and theories to explain his observation--- elements are made of atoms, they can combine together to make compounds, atoms of the same element are the same, you need chemical reactions to seperate compounds water is made of hydrogen and oxygen
electron negatively charged subatomic particles on the outside discovered by JJ Thompson in 1897
cathode ray glowing beam how he discovered the electron
proton positively charged subatomic particles discovered by goldstein
neutron subatomic particles with no charge but with a mass nearly equal to that of a proton discovered by Chadwick
nucleus tiny central core of an atom and is composed of protons and neutrons majority of the mass ,discovered by Rutherford
atomic number number of protons in the nucleus of an atom of that element oxygen--- atomic # 8---
mass number the total number of protons and neutrons in an atom hydrogen-1- number at the end is mass number
isotopes atoms that have the same number of protons but different numbers of neutrons 1+2=3
atomic mass unit (amu) defined as one twelfth of the mass of a carbon-12 atom the decimal points numbers
atomic mass weighted AVERAGE mass of the atom in a naturally occurring sample of the element THE AVERAGE MASS
atom smallest particle of an element that retains its identity in a chemical reaction hydrogen--- hydrogen atoms, oxygen----oxygen atoms
Created by: candye12