* Elements are the simplest pure substances that cannot be broken down further by chemical means. Examples include carbon (C), oxygen (O), and iron (Fe).

* Compounds are formed when two or more different elements combine chemically in a fixed ratio.

In Cr(NH₃)₆(NO₃)₃, we have multiple elements:

* Chromium (Cr)

* Nitrogen (N)

* Hydrogen (H)

* Oxygen (O)

These elements are combined in a specific ratio to form the compound.