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atomic structure (atomic number (the bottom left number (underneath the…
atomic structure
atomic number
nuclear symbol
tells us how many protons there are
every element has a different atomic number
the bottom left number
underneath the chemical symbol
nucleus
proton
neutron
mass number
total number of protons and neutrons
in the nucleus
top left number
above the chemical symbol
isotopes
an isotope is an element with different number of neutrons
lithium has two stable isotopes
lithium 6
has 3 protons
has 3 neutrons
lithium 7
has 4 neutrons
has 3 protons
the number of protons cannot change
it wouldn't be the same element
electron shells
electrons
an atom has the same amount of protons as electrons
they have opposite equal charges
they cancel out
leaving atoms with no overall charge