what are some characteristics of alkali metals?
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['High reactive metals.', 'Not found freely in nature.', 'Stored in a mineral oil solution.', 'Low melting points.', 'Low densities (lower than other metals)', 'Low electronegativity.', 'Low ionization energy.', 'React easily with halogens.']
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The alkali metals, found in group 1 of the periodic table (formerly known as group IA), are very reactive metals that do not occur freely in nature. These metals have only one electron in their outer shell. Therefore, they are ready to lose that one electron in ionic bonding with other elements.
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Although many characteristics are common throughout the group, the heavier metals such as Ca, Sr, Ba, and Ra are almost as reactive as the Group 1 Alkali Metals. All the elements in Group 2 have two electrons in their valence shells, giving them an oxidation state of +2.
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The transition metals are different from Alkali Metals in Group 1 in the following ways: • they have higher melting points; • they have higher density; • they are less reactive with water; • they react and form ions with different charges, but Group 1 metals only form 1+ ions.
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Alkali metals. The alkali metals make up group 1 of the Table, and comprise Li through Fr. They have very similar behavior and characteristics. Hydrogen is group 1 but exhibits few characteristics of a metal and is often categorized with the nonmetals.
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Alkali metals are reactive, soft metals with low densities. Noble gases are all unreactive non-metals. The alkali metals show trends in physical properties down the group.
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Due to the presence of weak metallic bonding alkali metals are soft and can be cut with a knife. ii) Reactivity ofmetals depends on ionization energy or ionization enthalpy. Alkali metals have large atomic size with only one valence electron. Terefore, they have weak metallic bonding between the atoms.
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"Alkali metals are good oxidizing agents." ... Alkali metals are strong reducing agents. This is so because of the ease with which they lose electrons. The atoms do not have a strong attraction for the single valence electron, and so it is easily lost (small first ionisation energy) to from a +1 ion.
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The alkali metals are a group of chemical elements from the s-block of the periodic table with similar properties: they appear silvery and can be cut with a plastic knife. Alkali metals are highly reactive at standard temperature and pressure and readily lose their outermost electron to form cations with charge +1.
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['In physical property metals contains lustrous surface and can polished. [00:07]', 'Metals are solid and heavy, even though sodium, potassium, magnesium, aluminium etc. are comparatively lighter metals. [00:16]', 'Metals are excellent conductor of warm and electricity. [02:40]', 'Melting points and boiling points of metals are very high. [03:19]']
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Alkali metals are good reducing agents because alkali metals have one valence electron which they lose to attain stability. Hence, they themselves undergo oxidation causing reduction of others and are good reducing agents. They have a single electron that they want to get rid of and become a +1 cation.
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alkali metals said to be most suitable for the photoelectric effect because the alkali metal have more and more tendency of loosing electrons and hence makes it easier for the photon to eject it out from the atom with the consumption of less energy.
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Alkali metals are extremely good conductors of electricity and heat. Alkali metals have one electron in their outermost shell which is held very weakly by the nucleus. The outer electron can drift further from the nucleus and move relatively freely.
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Their chemical activity increases as you move downward through the periods from Li to Na to K, etc. Alkali metals tend to lose one electron and form ions with a single positive charge. They form ionic compounds (salts) in reaction with the halogens (alkali halides).
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Lithium (Li), sodium (Na) and potassium (K) are part of group I of the periodic table and are known as alkali metals and have similar properties.
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Term. Alkaline earth metalsA group of chemical elements in the periodic table with similar properties: shiny, silvery-white, somewhat reactive at standard temperature and pressure. They readily lose their two outermost electrons to form cations with charge +2.
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It is classified as an alkali metal. Potassium atoms have 19 electrons and 19 protons with one valence electron in the outer shell. Potassium is considered chemically similar to sodium, the alkali metal above it on the periodic table. Under standard conditions potassium is a soft silvery-white metal.