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Shows how atomic numbers have provided the key to the ordering of elements in the periodic table.
Starting with a display of actual samples of over 70 elements, this program demonstrates methods by which chemical similarities among the elements have provided the basis for dividing them logically into families.
• The elements are classified as metals or non-metals, and some are found to be difficult to classify.
• Experimentally, it is shown that under the same conditions some gases are chemically reactive, while others are inert.
• The fact that elements with atomic numbers one less and one more than the atomic numbers of the inert gases are highly reactive, provides the clue for finding the halogen and alkali metal families.
• Shows how atomic numbers have provided the key to the ordering of elements in the periodic table.
• Color - 22 minutes.
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