Principal: Mr. T. Power, B.A. H.D.E.
Vice Principal: Ms. F. Greene, B.A. H.D.E.

Junior Cert














SCIENCE > PERIODIC TABLE

1. How Are Elements Listed?
Elements are listed in order of increasing atomic number.

2. What Are The Names Of The Groups?
Group 1 = Alkali Metals
Group 2 = Alkaline Earth Metals
Group 7 = Halogens
Group 0 = Noble Gases

3. Why Are Elements Placed In The Same Group?
Elements are placed in the same group because they have the same number of electrons in their outer shell.

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