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The Periodic Table



The Periodic Table

A Short Reader

Reading Level
     edHelper's suggested reading level:   grades 5 to 8
     Flesch-Kincaid grade level:   7.05

Vocabulary
     challenging words:    kalium, metalloids, nucleus, visual, element, atomic, abbreviation, legend, mass, arrange, background, number, similar, state, chemical, total
     content words:    Periodic Table, Many Periodic Tables


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The Periodic Table
By Cindy Grigg
  

1     The Periodic Table is a visual way to arrange the elements. Each element has its own square on the Periodic Table. That small square can tell you a lot about its element. You will see the atomic number of each element. You will see the chemical symbol and the element's name. You will also see the atomic mass number in each square. It tells the total number of protons and neutrons in the nucleus.
 
2     The atomic number tells how many protons are in the nucleus of the element. The letter or letters are the chemical symbol for the element. It's like an abbreviation of the name. But some elements were first given Greek or Latin names. So some of the symbols are tricky to remember. For example, potassium's chemical symbol is K. Potassium's Latin name is kalium. That is why its chemical symbol is K.
 
3     The color of the chemical symbol might mean something, too. Sometimes the background colors of the squares mean something else. These colors are often used to show which elements are metals, metalloids, or nonmetals. On the Table there will be a key or legend. It is just like a map's key or legend. The legend or key will explain what different colors mean. Many Periodic Tables show the element's normal state of matter at room temperature. Some elements are gases at room temperature. Some are liquids, and some are solids.

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