Nuclear Charge or Number of Protons In The NucleusĮxceptional Behaviour – Noble gases show exceptional behaviour. Reason – As we move left to right in a period the atomic number of the elements increases so nuclear charge increases while the number of shells in elements remains the same. The periodic trend of atomic radius across a period – As we move from left to right in a period, atomic radius gradually decreases.
Now, understand the trends of properties in detail by knowing the reason for the variation of properties.Ītomic radius is the distance between the centre of the nucleus of an atom to its outermost shell. Following properties of elements show a very clear periodic trend in the periodic table – Modern periodic law is the base of periodic trends of properties of elements in the modern periodic table. Periodic Trends of Properties of Elements In Periodic Table In this article, we will discuss periodic properties and their trends in the periodic table in detail. Periodic trends provide chemists with a quick and easy tool to quickly predict the properties of elements. Thus, we can say that elements having similar electronic configurations have similar properties. The recurrence of similar electronic configuration in the periodic table is the cause behind periodicity. The following figure shows the variation of periodic properties of elements.Īlthough we find some exceptions which do not follow these periodic table trends. For example, as we move from left to right in a period, atomic size decreases. That’s why elements show periodicity in their physical and chemical properties in the periodic table. In the modern periodic table elements have been arranged according to their atomic numbers and as stated above atomic numbers are directly related to their physical and chemical properties. Moseley gave the Modern Periodic law which states that “Physical and chemical properties of the elements are periodic functions of their atomic numbers”.
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