Increased understanding of isotopes made it possible to explain why the order based on atomic weights was not always correct. Electronegativity, ionic radius, atomic radius, electron. He also reordered some elements based on atomic weights. Chemistry library Unit: Periodic table Lessons Introduction to the periodic table Periodic table trends About this unit This unit is part of the Chemistry library. Periodic trends are the explanations for certain characteristics of elements in the periodic table. The Russian Chemist Dmitri Mendeleev’s solution was to leave some gaps for elements that he correctly predicted were yet to be discovered. This is also an astrological symbol for the planet Mercury. This resulted in incomplete tables and the placing of some elements in inappropriate groups based on their chemical properties. Mercury - Element information, properties and uses Periodic Table Mercury Hg Mercury 80 200.592 Fact box Uses and properties Image explanation The image is of a traditional alchemical symbol for mercury. This gives them similar chemical properties.Įarly attempts to classify the elements involved placing them in order of their atomic weights. The table was named the periodic table because similar properties occur at regular intervals.Įlements with similar properties are in columns called groups.Įlements to the left of this line are metals.Įlements in the same group of the periodic table have the same number of electrons in their outer shell. All the elements of the periodic table are arranged in order of increasing atomic (proton) number.
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