![]() The force of attraction between the nucleus and the electron is less than for smaller atoms, and the outer electron is lost more easily. The larger the atom, the further the outer electron is from the nucleus. An elements reactivity is its tendency to lose or. These atoms are larger because they have more shells. The reactivities of elements can be predicted by periodic trends (patterns within the Periodic Table.) Lets start with periodic trends. Group 1 elements become more reactive as we move down the group. This can be represented by a half equation (higher tier): A sodium atom loses one electron to form a sodium ion Group 1 metals all react in the same way, because each of them loses an electron to form a positive ion with a stable electronic configuration – a full outer shell.įor example, sodium loses one electron to form a sodium ion, Na +, with a full outer shell. potassium will do this as well but it is hard to see as the reaction is so fast and also potassium burns with a lilac flame and crackles as it explodes at the end of the reaction.sodium also melts to form a silvery-grey ball on the surface of the water.Some metals, such those in columns 1 and 2 on the periodic. the solution remaining at the end will be colourless. Reactivity refers to the tendency of a metal to react with chemicals in its surroundings. Metals tend to lose their valence electrons in chemical reactions, and in doing so, produce a full outer energy level like the noble gases.they will all release heat as they react as the reactions are exothermic and they will eventually disappear.the metals move about the surface of the water and fizz as hydrogen gas is produced.They would love nothing more than to get one more valence electron, so they love to. lithium, sodium and potassium are less dense than water so they float on the surface of the water. And these are highly reactive, because they have seven valence electrons. ![]() They have the same number of electrons in their outer shell, so they are similar in. There are some common observations and some differences: Elements in the same group of the periodic table show trends in physical properties, such as boiling point. Sodium + water → sodium hydroxide + hydrogenĪll Group 1 metal reacts with water. This is the equation for the reaction between sodium and water: They must be stored under oil to prevent them reacting with the air or water vapour.Īll Group 1 elements react with water to produce a metal hydroxide and hydrogen. ![]()
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