Atomic Structure, Periodic Table, Chemical Bonds, Chemical Formulas Worksheet Page 8
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2515A
The Periodic Table
Investigation
15A The Periodic Table
How is the periodic table organized?
Materials
Virtually all the matter you see is made up of combinations of elements.
Scientists know of 118 different elements, of which about 90 occur naturally.
• Periodic table tiles
Each element has its own unique kind of atom. The periodic table is a chart
that shows all of the elements in order of increasing atomic number.
A
Building the periodic table
Every element is given a symbol of one or two letters. For example, the symbol for hydrogen is
a capital letter H. The symbol for lithium is two letters, Li. Each element also has a unique
number called the atomic number. The periodic table is a chart that shows the elements in an
arrangement that helps us recognize groups of elements with similar properties. The picture
below shows the shape of the periodic table and the first few elements in sequence from left to
right. The elements are arranged from lowest to highest atomic number.
Using the chart as a guide, build the periodic table out of the periodic table tiles. The only tile
you should use yellow-side up is the hydrogen tile. The colors will show a pattern when you are
finished. There is a tricky part near the bottom of the table. The table breaks off between
element 56 (Ba) and element 71 (Lu), and fills in the first of two long rows underneath the
main part of the chart.
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