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Consequently, it is easier to remove the fourth 2p electrons from oxygen than it is, to remove one of the three 2p electrons from nitrogen.ī) The atomic size generally decreases across a period. (Hund’s rule) whereas in the oxygen atom, two of the four2p electrons must occupy the same 2p orbitals resulting in an increased electron repulsion. This arises because in nitrogen atom, three 2p electrons reside in different atomic orbitals. (March – 2009)ī) State the modern periodic law of elements.Ī) Mendeleev’s Periodic law : The physical and chemical properties of elements are periodic functions of their atomic mass.ī) Modern Periodic law: The physical and chemical properties of elements are a periodic function of their atomic numbers.Īccount for the following: (March – 2010)Ī) Ionization enthalpy of nitrogen is greater than that of oxygen.ī) Atomic radius decreases from left to right in a period.Ĭ) Electron gain enthalpy of F is less negative than that of Cl.Ī) Ionisation enthalpy of nitrogen is greater than that of oxygen.
Electron configuration ns2 np3 plus#
Kerala Plus One Chemistry Chapter Wise Previous Questions Chapter 3 Classification of Elements and Periodicity in PropertiesĪ) Who introduced the periodic law of elements for the first time? State the law.
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Here we have given Plus One Chemistry Previous Questions Chapter 3 Classification of Elements and Periodicity in Properties. Plus One Chemistry Chapter Wise Previous Questions Chapter 3 Classification of Elements and Periodicity in Properties is part of Kerala Plus One Chemistry Chapter Wise Previous Year Questions and Answer.