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What are trends in modern periodic table |
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Answer» Thanks Trends in the modern periodic table\tThe number of shells increases on going down the group.\tThe number of valence shell electrons increases with the increase in atomic number on moving from left to right in a period with each period marking the filling of a new electronic shell.\tAtomic size decreases in moving from left to right along a period due to an increase in nuclear charge pulling the electrons closer to the nucleus.\tAddition of new shells down the group increases the distance between the outermost electrons and the nucleus thereby increasing the atomic size down the group.\tAcross a period effective nuclear charge acting on the valence shell electrons increases which decreases the tendency to lose electrons. Hence metallic character decreases and non-metallic character increases across a period.\tDown the group, the effective nuclear charge decreases which increases the tendency to lose electrons. Hence metallic character increases and non-metallic character decreases down a group. Major periodic trends include: electronegativity , ionization energy , electron affinity , atomic radius , melting point, and metallic character . |
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