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These four groups are some of the most important on the periodic table.
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So let's take a look at the top four in each of the groups.
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So group one are the alkaline metals.
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First is hydrogen, symbol h, with an atomic number of one.
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Next we have lithium.
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Its symbol is l .i.
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And its atomic number is three.
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Then we have sodium, symbol n .a., atomic number of 11.
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Lastly, potassium is k, common number of 19.
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Now, the elements in this group often behave similarly.
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They usually want to lose one electron to get to noble gas configuration, so they'll often have a charge of 1 plus when they form ions.
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Next, we have the alkaline earth metals group 2.
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First, we have beryllium, symbol b .e, atomic number of 4.
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Then magnesium, its symbol is m .g...