Atoms

• Protons are positively charged particles found in the nucleus of an atom.
• All matter is made up of small particles called atoms.
• Law of conservation of mass is : Mass is neither created nor destroyed in a chemical reaction.
• Total mass of products = total mass of reactant.
• Constant proportion: A chemical compound always consists of the same elements combines together in the same proportion by mass.
• Dalton atomic theory states that : all matter is made up of tiny indivisible particles called atoms
• DAT: atoms cannot be divided.
• Hydrogen is H
• Helium is He
• Lithium is Li
• Boron is B
• Carbon is C
• Nitrogen is N
• Oxygen is O
• Fluorine is F
• Neon is Ne
• Magnesium is Mg
• Aluminium is Al
• Silicon is Si
• Phosphorus is P
• Sulphur is S
• Chlorine is Cl
• Argon is Ar
• Calcium is Ca
• Manganese is Mn
• Nickel is Ni
• Zinc is Zn
• Bromine is Br
• Krypton is Kr
• Iodine is I
• Barium is Ba
• Cobalt is Co
• Uraniun is U
• H is 1u
• C is 12u
• N is 14u
• O is 16u
• Na is 23u
• Mg is 24u
• Al is 27u