What r isomers and define isomerism​

sale Tera harami pan dekh rha hu sari ladkiyo ko message kar rha hai par mujhe number nai de rha

In chemistry, isomers are molecules or polyatomic ions with identical molecular formulas — that is, the same number of atoms of each element — but distinct arrangements of atoms in space. Isomerism is the existence or possibility of isomers. Isomers do not necessarily share similar chemical or physical properties.

Mr. Goog.le says