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Halogens is a very reactive nonmetals because they only need one electron to have a complete outer level.

The halogens starts at 9 and ends at 85 and it has seven elctrons.

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Nitrogen is the group 15 and it contains two nonmetals, two metalloids, and two metal
and its also  reactivity is varies among the elements.

The starts at 7 and ends at 115 and it has two nonmetals, two metalloids, and two metals and it has 5 electrons.

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Baron Group is the chemical elements in group 13 of the periodic table and they are boron, aluminum, Galium, indium, thallium, and perhaps ununtrium.

The baron group starts at 5 and ends at 113 and the group contains one metallic and five metals and it only has three electrons.

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The lanthanide and actinide series make up the inner transition metals.

The Lanthanides starts in 58 to 71.

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Alkaline-Earth- Metals are less reactive that alkali metals  and it only give two electron.

The Alkaline- Earth- Metals are very reactive but less reactive than alkali metals

and only have 2 electrons.

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The period on the periodic table is when the row horizontal and when the atomic numbers  increase from left to right.

The row of periods have 7 rows.

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Noble gases are unreactive nonmetal sand are in group18 of the periodic table they are helium, neon,   argon, krypton, xenon,and radon.

The noble gases never combine with anything.

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The oxygen group is also called chalcogen any of the six chemical making up group 16 are namely oxygen, sulfur, selenium, chalcogen, polonium, and livermorium.

The oxygen group has three nonmetals, one metalloid, and one metal and also has 6 electrons.

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The carbon group had one nonmetal, two metalloids ,and three metals and they are carbon,silicon, germanium, tin, lead, and ununquadium.

The carbon group starts at6 and needs at 114 and it only has one nonmeatl, two metalloids, and three metals.

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The lanthanide and actinide series make up the inner transition metals.

The Actinides starts at 90 and ends at 103.

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As with all metals, the transition elements are both ductile and malleable, and conduct electricity and heat.

The transition are all metals and they are less reactive than alkaline-earth metals they only have 1 or 2 electron.

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Akali metal is the most reactive because their atoms can easily give away the one outer-level electron.

The Akalim Metal starts at 3 and ends at 87.

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A group is a column of element that have the same number of electrons.

They call it family because they have the same electrons and more.