chem ch 4 

%%greeks%%= proposed atoms are made of earth

%%jj thomson%%= worked with cathode ray

%%chadwick%%= discovered the neutron

%%rutherford%%= discovered the nucleus

%%jj thomson%%= identified the electron

%%protons%%= positive charge, 1+ g (amu), inside the nucleus

%%neutrons%%= neutral charge, 0g (amu), inside the nucleus

%%electrons%%= negative charge, 1-g(amu), outside the nucleus

%%mass number%%= protons + neutrons

%%net force%%= protons + electrons

%%atoms%%= individusl building blocks of matter; pieces of elements from the table

%%molecules%%= anything made up of at least 2 non-metal atoms; can either be the same element

%%Protons and neutrons%%- the particles found in the nucleus

%%Protons%%- the particles that determine the identity of an element

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