Periodic Table - Gap Filling Quiz 3

Gap Filling Quiz

Fill in all the gaps, then press "Check" to check your answers. Use the "Give Me a Hint" button to get a free letter if an answer is giving you trouble. Note that you will lose points if you ask for hints!
The missing words are shown below in bold.
   100      argon      balloons      boiling      bromine      combust      decreases      gases      Halogens      liquid      mercury      metals      Neon      noble      properties      reactive      seven      sodium      unreactive   
The Periodic Table is made up of more than elements. The elements on the left hand side and in the centre are , while the non-metals are to be found on the right hand side. Only two elements are known to exist as a at room temperature. One of these, is a metal! The other is which exists as a liquid but vaporises quite easily. This element is a non-metal. The remaining non-metals are solids or at room temperature. The Periodic Table is conveniently arranged into groups of elements of similar chemical . One of these groups is called Group VII, or the . Each of the elements in group VII have electrons in their outer shell, and thus have similar chemical properties. The word Halogen means salt former, because they react easily with metals to form salts e.g. chlorine reacts with sodium to form the salt chloride. Their solubility in water as you go down the group while their melting and points increase going down the group. Fluorine, at the top of the group is the most , and the reactivity decreases going down the group. The last group in the Periodic Table is called Group 0, or the gases. These gases have a completely filled outer shell and thus are very . They are sometimes called the Inert Gases because of their lack of reactivity. There are only very small amounts of these gases in the atmosphere. One of these gases, helium, is used to fill and airships rather than using hydrogen, because unlike hydrogen it does not with oxygen in the air. is often used in advertising lights while is used in electric light bulbs.