Correct Option (d) In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group.. The alkali metals get their name from the caustic substances containing compounds of group 1 metals that were originally extracted from the ashes of burnt plants, 'al kali' in Arabic. they have one electron in their outermost energy level and they react by losing this electron to form positively charged ions In a reaction, this electron is lost and the alkali metal forms a +1 ion. They have loosely bound valence electron They contain large radii in the period They have low ionization energy and electronegativity. Have a higher density.. 4. Alkali metals are among the most reactive metals. Explaining trends in reactivity. In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group. All alkali metals have one electron in the outer shell. Potassium's symbol, K, comes from the same root. They tend to donate their electrons in reactions and have an oxidation state of +1. The alkali metals are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs),and francium (Fr). Alkali metals ( group one ) are highly reactive metals. In alkali, as we move down the group size increases thus an ability to lose electrons increases thus reactivity increases. Consequently, the attraction between the … Reactivity increases down the group. As you go down group 1 from lithium to francium, the alkali metals. The ionization energy of alkali metals can be explained by this periodic trend. Materials: Mg ribbon Petri dishes Ca Bunsen burner water candle on a stick dilute acetic acid 250 mL filter flask Balloons, rubber stoppers tongs Procedure: Part 2: Activity Series of Some Metals in HCl. these are group 1 elements Lithium, Sodium and Calcium. Describe and explain the trend in reactivity down the alkali metals group. Describe and explain the trend in reactivity down the alkali metals group. Electronegativity decreases down the group, thus reactivity of halogens decreases down the group. Alkali Metals Lithium is stored in oil because of its high reactivity. These metals are characterized by their soft texture and silvery color. The reactivity of halogens is due to their electronegativity. But I'm curious about which factors explain this trend. The Group 1 elements in the periodic table are known as the alkali metals. The metals listed are all alkali metals or alkali-earth metals. Alkali metals Alkali metals have less density compared to other metals. One of the most common traits of alkali metals is their reactivity to water and air. In general, it seems to be a trend regarding the reactivity of alkaline metals with water which says that as you go down the group, they become more reactive towards water. In a chemical equation, alkali metals are represented with an M. Here are some sample reaction equations: Alkali metals react with oxygen to form oxides, which have a duller appearance and lower reactivity. The periodic trend for these groups is: as you move down the group/family, reactivity increases. 3. The metals listed are all alkali metals or alkali-earth metals. Each succeeding element has its electron in one more shell than the previous element. Periodic Trends of Alkali Metals. When Group 2 metals react to form oxides or hydroxides, metal ions are formed.So this must be explained by the atomization energy of the metal and also the first … Go to the home page. Alkaline Earth Metals Loading... Found a content error? This is because the outer electron in each atom is further away from the nucleus as you go down the group and so the electrostatic forces between the nucleus and the outer electron are weaker. The electronic structure of the alkali metals is the basis for explaining their high reactivity and reactivity order. Alkali metals react violently with water, halogens, and acids. 4. Explain why the alkali metals are more reactive than the alkaline earth metals. Electropositivity increases down the group of alkali metals, thus the reactivity increases down the group of alkali metals. Why does reactivity increase or decrease down a group? Select an element from the top and drag it into the Flask. The Periodic Table. This is because on going down the group: The atoms get larger. Alkali metals. Have bigger atoms.Each successive element in the next period down has an extra electron shell. But they weren't isolated in pure form until 1807 (by the famous chemist Humphrey Davy). Explanation: The chemical reactivity of alkali metals is due to their ability to loose electron more readily than other elements. alkali metals. 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