1. NOMENCLATURE GRADE 10 SCIENCE SNC2D1

2. Elements We will consider that most elements exist as atoms - therefore the formula will simply show the symbol for the element: ironFe carbonC zincZn

3. Elements (The Special Ones) We will consider seven special elements referred to as “diatomic elements” - they normally exist as diatomic molecules so you will write the formula of the element showing a diatomic molecule. oxygenO 2 nitrogenN 2 (Memory aid - HOBrFINCl)

4. Ionic Bonding To achieve a stable electron arrangement, sodium gives up one electron (valence of 1), chlorine takes one electron (valence of 1) The resulting formula for sodium chloride is NaCl

5. Ionic Bonding To achieve a stable electron arrangement, magnesium gives up two electrons (valence of 2), chlorine takes one electron (valence of 1) Resulting formula for magnesium chloride is MgCl 2

6. Writing Formulae (A Simpler Approach) Write the symbols with the valence shown as a superscript. Cross the valences to determine the formula.

7. Writing Formulae (A Variation) Write the symbols with the valence shown as a superscript. After crossing the valences reduce any common multiples from the valences.

8. Naming Ionic Binary Compounds (A Simple Job... so far) Write the name of the metalic element first. Write the name of the non-metalic element next, changing the end of the name to “... ide”. AlCl 3 aluminum chloride Li 2 O lithium oxide ZnS zinc sulphide

9. Binary Acids Binary acids contain hydrogen and one other element in a compound that has been dissolved in water. Names start with “hydro...”; they end with “…. ic”. The formula for a binary acid looks like the formula for an ionic compound with the designation (aq) written after the formula. hydrochloric acidHCl(aq) hydrosulphuric acidH 2 S (aq)

10. Binary Acids hydrobromic acid HBr (aq) hydroselenic acid H 2 Se (aq) H 3 P (aq) hydrophosphoric acid HI (aq) hydroiodic acid

11. Your Turn !!!! You are now in a position to work on the first nomenclature practice page.