atoms
relative charge of a proton
+1
relative mass of a proton
1
relative charge of a neutron
0
relative mass of a neutron
1
relative charge of a electron
-1
relative mass of electron
1/2000
atomic number
the number of protons inside the necleus of an atom
mass number
the number of protons and neutrons inside the necleus of an atom
how to calculate neutrons
take the bottom number from the top number
shell 1
2 electrons
shell 2
8 electrons
shell 3
8 electrons
shell 4
whatever is left
group number =
number of electrons in the outer shell
magnesium + oxygen =
magnesium oxide
3 types of ionic bond
ionic, covalent and metallic