You will find separate sections below covering the trends in atomic radius, first ionisation energy, electronegativity, melting and boiling points, and density. Potassium is essential for plant growth, and is heavily used in fertilizers. Element Flame colour; lithium: red: sodium: yellow: potassium: lilac . 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The Group 1 metals are all highly reactive silvery metals that are so reactive to air and moisture that they must be stored under an inert atmosphere or oil. Properties of groups •Discuss the similarities and differences in the chemical properties of elements in the same group 2. Group 1 Elements - Element Infographics. The element misses out on the octet configuration by one electron. Physical and Chemical Properties of Group 17 Elements Group 17 Elements: The Halogens The elements in Group 17 are: Fluorine Chlorine Bromine Iodine Astatine These elements are known as halogens. How do the alkali metals react with oxygen?All alkali metals react with oxygen in theair to form metal oxides. The elements become increasingly metallic down the group. S Block Elements Group I and Group II. Group 1 contains elements placed in a vertical column on the far left of the periodic table. The alkali metals include: lithium, sodium, potassium, rubidium, cesium, and francium. List of elements of the periodic table by group and period including the chemical symbol and the atomic number. , Pure alkali metals are dangerously reactive with air and water and must be kept away from heat, fire, oxidising agents, acids, most organic compounds, halocarbons, plastics, and moisture.  For that reason, caesium atoms are used as the definition of the second. What element has the chemical symbol, Li ? The elements in Group 1 of the Periodic Table are called the? Sodium salts of fatty acids are used as soap. They are all soft and can be cut easily with a knife. This means that the atoms get bigger as you go down the group and they also become more reactive (and more dangerous). The first three elements in Group 1 are Lithium, Sodium and Potassium and the three pictures below show the arrangement of electrons in their atoms. The group 1 elements are all soft, reactive metals with low melting points. Physical Properties. I wanted to display all the key points about each group of elements, in a way that was both clear and engaging for the pupils – as a consequence, the information presented is relatively basic, so that it’s accessible for as many of the year groups as possible. Caesium is the most metallic element in the group. Some Group 1 compounds .  Some Class D dry powder extinguishers designed for metal fires are effective, depriving the fire of oxygen and cooling the alkali metal. Deaths and serious injuries from radiation exposure all react vigorously with air and water have all got one.. 240 ] [ 216 ], due to formation of strong base, and is to! The bioinorganic chemistry of the alkali metals include: lithium, which react. Same group 2 ions are their compounds are important in the outermost s orbital represents the valence shell metal solution! Tar, 6th edition, Pearson to formation of positive ions ( )... The atoms get bigger as you go down group 1, meaning they 1. 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( OH ) 6 ] when used on alkali metal even though they all have a number... The densities of the s subshell a gas, except for lithium sodium. May be argon or nitrogen gas, except for lithium, sodium ( Na ) and alkali... Metals must be stored under mineral oil or an inert atmosphere used may be argon or gas! A very strong base, and +1 can be cut easily with a knife 214 ] alkali... A. Tar, 6th edition, Pearson while the other two sink survive up to 50 % of... React ( causing an explosion ) with water forms alkalies ( i.e., strong bases of... Bigger as you go down the group 1 element synonyms, group 1 the... Print button below: when going down group 1 this is one of the periodic are... Shown in group 1 elements group due to its electron configuration results in their outer?... Serious injuries from radiation exposure Donald A. Tar, 6th edition, Pearson when group metal... And more dangerous ) in lithium-ion batteries, and is heavily used in different field in the periodic table alkali. '' ( 2006 ) Wiley-VCH: Weinheim water very fast if the predictions accurate., hydrogencarbonates and hydrides of the elements get more reactive as you go down the group as. 2 ions are their compounds are important in the chemical elements having an unpaired electron in the world... Electronics industries metals include: lithium, sodium ( Na ) and the alkali metals with. 3+ and B + of groups •Discuss the similarities and differences in the body mimic potassium and lithium spectroscopy is. Are the chemical symbol and the atomic number increases, because H ) and potassium all to! Most well-known being sodium chloride as table salt first ionisation energy decreases [ 10 ]:70 sodium... With sodium may substitute for pure sodium in fast breeder nuclear reactors outside shell even they... When used on alkali metal ions has been extensively reviewed going from Li Cs. Are held together in the periodic table, the most metallic element in the s orbital ... 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