chemistry yr9 atomic structre

chemistry yr9 atomic structre

1. elements are arranged in groups and periods

   • the horizontal rows are periods
   • the vertical are called groups

2. the electric structure is that it goes up in one

   • atoms that have the same number of protons (elements) but different numbers of neutrons

3. the center part of the atom is called the nucleus

   • the nucleus is made with neutons and protons
   • the electrons are on the outer shells
     • in the first shell you are allowed only up to 2 electrons
       • the others are going up to 8 electrons

4. the plum pudding model is made by jj tompson

   • there is also the niels bhor model called the nuclear model
     • james rutherford made the planetery model