Sadly the element of surprise was not invited introduction to the periodic table The elements that are situated in the periodic table, and the periodic table itself, has become the core learning aid for chemistry students, scholars and scientists alike. First published in 1869 by a Russian chemist, Dmitri Mendeleev.It combines and summarizes vast amounts of information about elements in a way that facilitates the predictions of many of the properties and chemical reactions. The periodic table is an arrangement of chemical elements ordered by their atomic number, electron configuration and rate of activity. Elements are constructed in seven horizontal rows called periods, that are arranged in increasing atomic number further along the …show more content…
The elements that are found in group 1, progressively increase in reactivity as they move down the table. Reacting vigorously with water to form the metal hydroxide and hydrogen. For example: Sodium + water → sodium hydroxide + hydrogen Potassium + water → potassium hydroxide + hydrogen As these element are highly reactive, even if they get in contact with air and water, extra care is taken when storing these elements. For this reason they are stored under oil. properties of alkali metals When lithium, sodium and potassium react with water they float on the surface, this is due to their density being less dense than the density of water. when this reaction occurs hydrogen is given off. The metal reacts with water to form an alkali, this is the hydroxide of the metal. sodium forms sodium hydroxide potassium forms potassium hydroxide and so forth when these elements react with water not only is a hydroxide formed but the ways in which these elements react with water follow a pattern Lithium reacts quickly and vigorously with water Sodium reacts very quickly and vigorously with water Potassium reacts extremely vigorously with water and produces a lilac …show more content…
A word equation can be constructed of such reactions. For instance the reaction between sodium and bromine Sodium + bromine → Sodium bromide Group 7 trends A specific trend can be distinguished of the physical semblance of the halogens at room temperature. Chlorine is a gas, bromine is a liquid and iodine is a solid. Unlike most elements in the periodic table, the order of reactivity of halogens increase as you go up the group. Halogen is more reactive than chlorine Chlorine is more reactive than bromine bromine is more reactive than