Question

how oxidation and reduction tendency changes in a periodic table

Answer 1

Oxidation & Reduction

Oxidation = The losing of electrons

Reduction = The gaining of electrons

This also relates to electronegativity values, where elements with a high electronegativity (Want electrons) will undergo reduction very easily, and elements with low electronegativity (Do not want electrons) will undergo oxidation very easily

A redox (Reduction/Oxidation) reaction is the transfer of electrons from one atom to another.

Some atoms want to get rid of electrons, while other atoms want to take extra electrons, and this movement of electrons is a redox reaction.

In each redox reaction, there are two processes going on: Oxidation, and Reduction