If an element is a isotop does it do anything to a formula that it is in?

Question

If an element is a isotop does it do anything to a formula that it is in?

Answer 1

In chemical properties it does not change anything. An isotope as same chemical properties , stable or not.

But, if it disintegrates it changes physical properties and also radioactivity which is a physical property

Answer 2

Yes. First, it changes the mass of the compound that isotope is in. Second, that isotope may be unstable, causing it to decay. This decay may cause the compound to disintegrate also.  

Answer 3

isotopes are atoms of the same element with different numbers of neutrons and different atomic masses.

Chemical compounds with different isotopes generally behave very similar to one another in most reactions.  But they may behave differently in some specific reactions and may behave differently in certain environments.

An example is deuterated chloroform.   deuterium is hydrogen with 1 neutron and an atomic mass of 2 amu's.   Chloroform is CHCl3.  deuterated chloroform is CDCl3.  (deuterium is commonly referred to as D).   deuterated chloroform is commonly used as a solvent or a marker in an instrumental method of chemical analysis called "nmr" or "nuclear magnetic resonance" because the D behaves differently than H in a strong magnetic field.

Another example is deuterated water.  Heavy water is D2O and has a very different bond length and associated energy than H2O.  This drastically effects biological reactions.