Chapter 7 Periodic Properties of the Elements Chemistry, The Central Science. Francium is the least abundant element in this universe, and one of the most interesting facts about it being, that at any time, there are only a few ounces of francium that exists on earth!Įverybody who has a keen interest in chemistry must properly study this pictorial representation of elements, that helps in memorizing important features, and relate to trends of physical and chemical properties of elements. Periodic Properties of the Elements Periodic Trends In this chapter.There are 110 known elements and 18 periods in the periodic table, as established by the IUPAC authority since 1985.Hydrogen is the lightest and most abundant element in the universe. In fact, organic chemistry is a branch totally dedicated to carbon compounds. Worked example: Identifying an element from successive ionization energies.
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