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atoms
basic units of matter
made up of subatomic particles
What are atoms made up of
protons
electrons
neutrons
Atom diagram
nucleus = protons + neutrons
outside nucleus = electron cloud

electron cloud
where electrons are
makes up most of the atom’s value
neutral atom
=’s of protons + electrons
subatomic particles
protons
electrons
neutrons
charge
protons 1+
electrons 1-
neutrons 0
mass (mass unit = u)
protons 1U
electrons 0.0005U
neutrons 1U
Mass number
protons + electrons
all the mass of an atom
located in the nucleus