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Halogens are elements found in group seventeen. It is said that ununseptium (117) could possibly b a halogen as well. They are nearly totally non-metal elements. Only group 18 has pure non-metals.

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The nitrogen group holds elements from group thirteen, and is named after the first element in that column.

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The boron group holds elements from group eleven. This group is named after the first element in the column.

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The lanthanides series includes elements from the atomic number 57-71. They are the rare earth elements.

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Alkaline-earth metals are in the second group. They still have metal characteristics, but just weaker ones.

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A period is basically a row of elements. There are seven periods, with the two bottom rows not counted as separate.

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Noble gases are found in the last group. They will never mix with other elements.

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The oxygen group holds elements from group 14.

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The carbon group holds elements from group twelve. This group is also named after the first element there.

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The actinides series includes elements from the atomic number 89-103. The name is from the first element there.

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Transition metals are the metals found in groups 3-10. They don't have a stable number of electrons.

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Alkali Metals are the elements found in the first group. They have the strongest metallic characteristics.

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A group or family is a column that contains elements that have something in common. There are 18 groups in total.