![]() ![]() Hard and strong High density High melting point (except mercury) Quite unreactive Form ions with different charges (e. Lowest melting point More reactive halogens displace less reactive halogens F2(aq) + 2KI(aq) 2KF(aq) + I2(aq) Least reactive Highest melting point Br2(aq) + 2KCl(aq) NO REACTIONħ Transition elements They share many properties: ![]() Their melting point increases going down the group. As you go further down the group, the nucleus is further from the outer shell, so there is less attraction between it and the electron it wants to gain. Most reactive Low melting point Poor conductors of heat and electricity They form 1- ions They get less reactive going down the group. Concept: Periodic Properties - Periodic Properties. Metal + halogen metal halide Highest melting point Most reactive Lowest melting pointĦ Group 7: The halogens F2(aq) + 2KI(aq) 2KF(aq) + I2(aq) The horizontal rows are known as periods and vertical columns in the periodic table are known as groups. 7 What are the vertical columns in the Periodic Table called 8 How many electrons are there Make sure you understand these KEY TERMS terms before moving. Metal + water Metal hydroxide + hydrogen The react with halogens to make a metal halide. They react with water to produce metal hydroxide and hydrogen. Their melting point decreases going down the group. Least reactive Low density Very reactive They get more reactive as they go down the group as there is less attraction between the outer electron and the nucleus so it is easier for the electron to leave the nucleus. It is harder for the atom to gain an electron. There is less attraction between the negative electron and the positive nucleus. As they go down the group, their outermost electrons get further from the positive nucleus. This is because: Group 7 elements want to gain electrons. It is easier for the electron(s) to leave the atom.Ĥ Group 7 elements become more reactive as you go up the group. This is because: Group 1 and 2 elements want to lose electrons. Reactions of the alkali metals (group 1 elements) Reactivity of the alkali earth metals (group 2 elements) Reactivity of the halogens (group 7 elements) Uses of the noble gases (group 0 elements)ģ Group 1 and 2 elements become more reactive as they go down the group. Presentation on theme: "The vertical columns of the periodic table are called groups."- Presentation transcript:ġ The vertical columns of the periodic table are called groups.ġ 2 The horizontal rows are called periods 3 4 5 6 7Ģ What is the link between the group number of an element and how the element reacts? The table is also arranged in vertical columns called groups or families and horizontal rows called.
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