1. 4.14 Chemical Families (Sec 8.4 pg 248-253)

2. The members of your family likely have certain traits in common (especially if you are a Constantine). Elements in a chemical family also share certain traits. They are not identical, but have share important things in common.

3. The chemical families that we focus on in grade 9 science: Alkali metals (first column) ColourSilvery-grey Density0.53 g/cm 3 to 1.88 g/cm 3 Melting PointLow; solid at room temp ConductivityVery good for electricity and heat ReactivityVery reactive Ion Charge1+

4. The chemical families that we focus on in grade 9 science: Alkaline earth metals (second column) ColourSilvery-white Density1.55 g/cm 3 to 5.00 g/cm 3 Melting PointHigher than alkali metals; solid at room temp ConductivityVery good for electricity and heat ReactivityVery reactive Ion Charge2+

5. The chemical families that we focus on in grade 9 science: Halogens (17 th column) ColourRange of bright colours as gases Density0.0017 g/cm 3 to 4.93g/cm 3 Boiling PointLow Health Effects Very toxic ReactivityVery reactive, forms acids with hydrogen. Ion Charge1-

6. The chemical families that we focus on in grade 9 science: Noble gases (last column) ColourColourless Density0.0018 g/cm 3 to 0.00973/cm 3 Boiling PointVery Low (for example -269 o C) ReactivityNon-Reactive Ion Charge0

7. Check out Hydrogen (Table 5 pg.253) It is so unique, it is often called a ‘family of one’.