atoms

atoms

1. make up elements

   • make up everything
     • two types of elements mixed together create a compound

2. Ions

   • an atom with a positive or negative charge
   • caused by the removal or addition of an electron
   • electron shells must be filled, this can mean that an electron(s) is removed or gained
   • opposites attract
   • Ionic bonding occurs between metals and non-metals
   • electrons are added or taken from and atom which makes the atom have a positive or negative charge
   • the outer shell is filled
   • an ionic compound is in crystal form
     • always form a lattice
   • swap and drop method is used when writing an ionic compound formula

3. chemical reactions take place all around us.

   • atoms cant be created or destroyed
     • Reactants ___> Products
       • there must always be the same amount of atoms on each side

4. in the nucleus there is protons (+) and neutrons (neutral)

   • surrounding the nucleus are electrons (-)

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