Chemistry 1

Chemistry 1

1. Atoms, Elements and Compounds

   • each element is made up of one type of element
   • atoms are represented by chemical symbols
   • In the periodic table they're arranged in groups called columns
     • The groups will have elements that usually share similar properties
   • Atoms have a tiny nucleus surrounded by electrons
     • When elements react, their atoms join with atoms of other elements
       • Compounds are formed when 2 or more elements combine together

2. Atomic structure

   • The nucleus contains 2 types of particles
     • Protons - which have a positive charge
       • Neutrons- which have no charge
   • Electrons are tiny negatively charged that more around the nucleus
   • An atom has no overall charge. this is because the number of protons is equal to the number of electrons (their charges are equal and opposite proton +1, electron -1)