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Periodic Classification of Elements

What you will learn

  • Elements are classified on the basis of similarities in their properties.

  • Döbereiner grouped the elements into triads and Newlands gave the Law of Octaves.

  • Mendeléev arranged the elements in increasing order of their atomic masses and according to their chemical properties.

  • Mendeléev even predicted the existence of some yet to be discovered elements on the basis of gaps in his Periodic Table.

  • Anomalies in arrangement of elements based on increasing atomic mass could be removed when the elements were arranged in order of increasing atomic number, a fundamental property of the element discovered by Moseley.

  • Elements in the Modern Periodic Table are arranged in 18 vertical columns called groups and 7 horizontal rows called periods.

  • Elements thus arranged show periodicity of properties including atomic size, valency or combining capacity and metallic and non-metallic character.