Chemistry
Give reasons for the following assertions :
(a) The oxidising power of elements increases from left to right along a period.
(b) Ionisation potential of elements increases across a period from left to right.
(c) Alkali metals are good reducing agents.
Periodic Table
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Answer
(a) The oxidising power of elements increases from left to right along a period because electro-negativity and the non metallic character increases from left to right. As oxidising power depends on tendency to gain electrons and non-metals are good oxidising agents hence oxidising power of elements increases across a period.
(b) The ionisation potential of element increases across a period because the atomic size decreases due to an increase in nuclear charge and electrons in the outermost shell are more strongly held because of which greater energy is required to remove the electron.
(c) Alkali metals have one electron in their valence shell. In order to be stable, they easily lose this electron and get oxidised. Hence, they are good reducing agents.
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