C1- Atoms and Ions

C1- Atoms and Ions

1. Atoms, elements and compounds.

   • Atom-the smallest particle that can exist by itself
   • Element- two or more of the same type of atom chemically joined together
   • compound- two or more types of different elements joined chemically joined together
   • in the centre of an atom is a nuclease
     • in the nuclease there is protons and neutrons
       • neutrons have a neutral charge
         • These two have the same amount in a atom
       • protons have a positive charge
     • electrons orbit the atom in shells

2. Atoms

   • How to find the number of neutrons
     • C
     • 6
       • Number of protons and neutons
     • 12
       • Atomic mass
     • You subtracted the smaller number from the bigger number
   • the first shell holds two electrons
     • the other shells can holed 8

3. Elements

   • lithium
   • potassium
   • carbon
   • hydrogen
   • helium
   • calcium
   • sodium
   • neon
   • argon
   • fluorine
   • chlorine

4. Ions

   • Names
     • Enter text here