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Periodic Table

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by

Jerry Wilson

on 5 September 2012

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Transcript of Periodic Table

The periodic table arranges all elements in order of Atomic Number. Atomic Number = Number of protons in the nucleus Atomic Symbol is a one- or two-letter abbreviation for an element. Elements are arranged in rows and columns. Rows are called periods. Elements in a period all have the same number of energy levels. Columns are called groups. Elements in the same group share similar properties. Elements in this group are called Noble Gases. They do not react well with any other element. Nonmetals are on the far right of the table. Most elements are metals. They are on the left and in the middle. Elements between the metals and nonmetals are called metalloids. Transition Elements are the heavy metals in the middle of the table. Chlorine is a brownish gas that is highly reactive with elements in group 1. Mercury is a metal that is liquid at room temperature. Germanium is a metalloid. Helium is a noble gas used in blimps and balloons. Iron is a transition element. Lithium and sodium react the same in water.
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