1. Drawing Bohr- Rutherford Diagrams Science 10 Chemistry Unit

2. Drawing Bohr-Rutherford Diagrams for Neutral Atoms Remember that for neutral atoms the Remember that for neutral atoms the # protons = # electrons # protons = # electrons Look at the atomic number to see how many electrons the neutral atom has Look at the atomic number to see how many electrons the neutral atom has Look at the period number of the element (the horizontal row that goes across the periodic table) Look at the period number of the element (the horizontal row that goes across the periodic table)

3. The period number tells us how many “ orbitals ” or “ shells ” the electrons are in. Now draw these orbitals around the element symbol. The period number tells us how many “ orbitals ” or “ shells ” the electrons are in. Now draw these orbitals around the element symbol. Remember these values: Remember these values: 1. 1 st shell : maximum of 2 electrons 2. 2 nd shell : maximum of 8 electrons 3. 3 rd shell : maximum of 8 electrons 4. 4 th shell : maximum of 18 electrons