Question

wha is oxidation number and trick to find out​

Answer 1

a number assigned to an element in chemical combination which represents the number of electrons lost (or gained, if the number is negative), by an atom of that element in the compound.

ways to find oxidation numbers are :

• The oxidation number of a free element is always 0.
• The oxidation number of a monatomic ion equals the charge of the ion.
• The oxidation number of H is +1, but it is -1 in when combined with less electronegative elements.
• The oxidation number of O in compounds is usually -2, but it is -1 in peroxides.