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Halogens are nonmetals and are highly reactive.

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Alkali Metals have a low melting point
highly reactive at a standard temperature and pressure.

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Alkali Metal Explosion - Mythbusters for the Impatient

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Noble Gases
elements: He, Ne, Ar, Kr, Xe, Rn, Og

conduct electricity

fairly nonreactive

low boiling points

no color, odor or flavor

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Noble Gases - The Gases In Group 18 | Properties of Matter | Chemistry | FuseSchool

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-highly reactive at a standard temperature and pressure.
-it is silvery

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Chemistry Flame Test Alkaline Earth Metals

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Alkali metals are all soft, shiny reactive metals. Although they are soft enough to cut with a knife, exposing a bright surface, the metals react with water and air and quickly tarnish, so the pure metals are stored in an inert atmosphere or under oil to prevent oxidation. All of the metals react vigorously with water, with the energy of the reaction increasing as you move down the periodic table. None of the alkali metals exists free in nature: They are found as salts, forming crystals with the body-centered cubic structure

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Alkali metals are all soft, shiny reactive metals. Although they are soft enough to cut with a knife, exposing a bright surface, the metals react with water and air and quickly tarnish, so the pure metals are stored in an inert atmosphere or under oil to prevent oxidation. All of the metals react vigorously with water, with the energy of the reaction increasing as you move down the periodic table. None of the alkali metals exists free in nature: They are found as salts, forming crystals with the body-centered cubic structure

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These reactive nonmetals have seven valence electrons. As a group, halogens exhibit highly variable physical properties. Halogens range from solid (I2) to liquid (Br2) to gaseous (F2 and Cl2) at room temperature. As pure elements, they form diatomic molecules with atoms joined by nonpolar covalent bonds.The chemical properties are more uniform. The halogens have very high electronegativities. Fluorine has the highest electronegativity of all elements. The halogens are particularly reactive with the alkali metals and alkaline earths, forming stable ionic crystals.

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These reactive nonmetals have seven valence electrons. As a group, halogens exhibit highly variable physical properties. Halogens range from solid (I2) to liquid (Br2) to gaseous (F2 and Cl2) at room temperature. As pure elements, they form diatomic molecules with atoms joined by nonpolar covalent bonds.The chemical properties are more uniform. The halogens have very high electronegativities. Fluorine has the highest electronegativity of all elements. The halogens are particularly reactive with the alkali metals and alkaline earths, forming stable ionic crystals.

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- alkaline earth metals are very reactive but less than Alkali metal
- They are shiny but appear dull because of the oxide layers.
- Except for beryllium, they all form corrosive alkaline hydroxides.
- If you ever hear except in Alkaline Earth Metal than think of Beryllium.