atomic structure

atomic structure

1. facts

   • all atoms are made up of protons neutrons and electrons
   • an elements has only one kind of atom
   • there has to be the same amount of protons as electrons
   • atoms are measured in atomic mass
   • there are isotopes which have different amount of neutrons
     • e.g chlorine has 35 neutrons and 37 neutrons and 75% are 35 and 25% are 37 therefore you do (35x75)+(37x25) = 2625 + 925 =3550 3550/100 = 35.5
   • to find the amount of protons in an element you you just look at the bottom number and it is the same
   • to find the neutrons you do the top number - the bottom number

2. sub-atomic structure

   • protons
     • found in the nucleus
     • has a mass of 1
     • is positive charge +1
   • neutrons
     • found in the nucleus
     • has a mass of 1
     • doesn't have a charge is neutral 0
   • electrons
     • found i shells
     • has a mass of almost 0
     • has a negative charge

3. different atomic model

   • 1. daltons billard ball model atom in 1805 its a solid sphere with a small circle in it
   • 2.thomson's plum pudding model 1904 its still a solid sphere but is has negative and positive particles
   • 3. Rutherford nuclear atomic model 1911 it is a model with a solid nucleus that has shells going around it with negative charged particles on it