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they all have 2 valence electrons .
less reactive than alkali metals

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They are shiny, silvery, highly reactive,readily lose their outermost electron

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ALKALI METALS |GROUP I| PHYSICAL PROPERTIES| S BLOCK ELEMENTS (L 1)

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They all conduct electricity, are fluoresce, are odorless, are nonflammable, and are colorless.
Contains helium, neon, argon, krypton, xenon, and radon.
Noble gases are group 18 with 8 valence electrons.

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

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They are reactive with air and water and they are shiny, soft, silvery. alkali metals must be stored under oil to prevent reaction with air

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Chemistry Flame Test Alkaline Earth Metals

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Halogens are nonmetals in group 17  of the periodic table. Down the group, atom size increases.Due to their high effective nuclear charge, halogens are highly electronegative.fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At) Are the elements.We use the element chlorine to purify water when we go swimming.

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Sodium and Halogens Explosive Reactions! | Chlorine, Bromine, Iodine

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Alkaline earth metals tend to be shiny and silvery white. They are somewhat reactive at standard temperature and pressure. They have low densities, melting points, and boiling points.
-JaCynda

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Halogens are highly reactive, and they can be harmful or lethal to biological organisms in sufficient quantities. This reactivity is due to high electronegativity and high effective nuclear charge. Halogens can gain an electron by reacting with atoms of other elements. Fluorine is one of the most reactive elements.

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Group 2 - Alkaline Earth Metals | Properties of Matter | Chemistry | FuseSchool

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Group 7 - The Halogens | Properties of Matter | Chemistry | FuseSchool