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isotope
weigh, so proton+neuron
electron
same as proton which is same as atomic number
proton
same as atomic number
neutron
atomic mass- proton
catalyst
speed up chem reaction
bystander who help out but don’t get involved
catalyst not used up nor change
base
turn litmus paper blue
have bitter taste like soap
dissolve oil and grease
with water make hydroxide ion
acid
turn litmus paper red
sour taste
donate proton
with water make hydrogen