Key Concepts Rewrite the following sentences in your copybook and fill in the blanks. 1. Three properties of metals are _____________, _____________ and ______________. 2. Three properties of non-metals are ______________, ______________ and ______________.
3. ______________ is the deterioration of a metal as a result of a reaction between it and the surrounding environment.
4. ______________ is a form of corroded metal. 5. The Periodic Table is divided into two main categories, ______________ and ______________.
6. There are ______________ naturally occurring elements on the Periodic Table. 7. The elements on the Periodic Table are listed in order of increasing ______________ ______________.
8. The columns of the Periodic Table are called ______________. 9. Each ______________ contains elements with similar properties. 10. Methane gas has the formula ______________. This means that it contains ______________ atoms of ______________ and ______________ atom of ______________ in each molecule.
11. In order to be stable, atoms lose, gain and share electrons to achieve a ______________ outer ______________.
12. ______________ compounds are formed when electrons are lost and gained. 13. ______________ compounds are formed when electrons are shared.
K U
Knowledge and Understanding 1. Suggest a reason for each of the following:
(a) Bells are made from metal. (b) The handle of a saucepan is often made of plastic. (c) Electrical cables are made from copper. (d) Gutters on our homes are made from plastic. (e) Bridges are constructed from iron. (f) Metals should always be recycled.
2. Use the Periodic Table to answer the following questions: (a) How many electrons are in the outer shell of each atom in Group 2? (b) The rows on a Periodic Table are called periods. How many energy levels are in the atoms of each element in period 2 (Li – Ne)?
(c) What is the group number of the halogens? (d) What do the elements in each group have in common?
