Question

Give reasons- the oxidising power of elements increses from left to right along a period.

Answer 1

Hey friend!!!

The oxidising power of the element is defined as the ability of element to oxidise other substance by taking electrons, thus the element that can gain electron easily will be able to oxidise other substances. Since the power to gain electron is determined by the electron gain enthalpy and electronegativity of the element, which both increase across a period .Higher the electron gain enthalpy and electronegativity value higher will be the tendency of element to accept electron thus greater will be the oxidising nature. Since both electron gain enthalpy and electronegativity of the element, increase across a period thereby, the oxidising power of the elements also increases across the period.
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Answer 2

metals are reducing agents,hence have less oxidising character whereas halogens are great oxidising agents ,this is because metals have tendency to give electrons whereas halogens have tendency to accept electrons.that's the answer to your question