Atomic structure

Atomic structure

1. Particles

   • Protons
     • Positive charge
     • Relative mass of 1
     • Protons make up the atomic number of an element
   • Neutrons
     • Neutral charge
     • relative mass of 1
     • The sum of protons and neutrons make the atomic mass of the element
   • Electrons
     • Negative charge
     • No negligible mass
     • Equal number of protons and electrons in an element
     • Electrons are in shells surrounding the nucleus, this determines the volume of the atom

2. Chemical equations

   • Reactants go on the left, products on the right
   • Must be balanced, a big number can be put infront of the substance but smaller numbers cannot be changed
     • H2SO4+NaOH=Na2SO4+H2O