Periodic Table
As scientists began experimenting with the various types of elements that exist, they decided that they needed a way to organize them. What developed was a classification chart called the Periodic Table of Elements. Each element is placed in order based on its number of protons and electrons and on its properties.
In other words, if an element has 2 protons and 2 electrons, such as helium, it would be number 2 on the chart.
And since helium is a gas, it would be located in the section of the table that deals with gases.
interactive Periodic Table link
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Below is a copy of the Periodic Table of Elements. Notice the numbers above and below each element. These are called the atomic number and the mass number.
For more information on atomic and mass
numbers, go to the atomic and mass number page.
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