A Markov chain is a discrete random process with the property that the next state depends only on the current state (wikipedia). A Markov chain is a discrete random process with the property that the next state depends only on the current state (wikipedia). So $P(X_n | X_1, X_2, \ldots X_n-1) = P(X_n | X_{n-1})$.
Some people find molecules and compounds confusing. Here's how to remember the difference. If you join two different chemical elements together, you can often make a completely new substance. Glue two atoms of hydrogen to an atom of oxygen and you'll make a single molecule of water.
Atoms of elements (and ion forms) make up molecules, which can  combine with other atoms and molecules to form compounds. To be  more scientific:   An atom is the smalle â¦ st component of any element having all the  chemical properties of that specific element.toms of elements (and ion forms) make up molecules, which can  combine with other atoms and molecules to form compounds. To be  more scientific:   An atom is the smalle â¦ st component of any element having all the  chemical properties of that specific element.