Final answer:
Reactivity refers to how easily a substance combines with other substances. It is an important concept in chemistry and is influenced by factors like electron arrangement and bond nature.
Step-by-step explanation:
The term used to describe how easily a substance combines with other substances is reactivity. Reactivity refers to the tendency of a substance to undergo a chemical reaction with other substances. This can be influenced by factors such as the presence of reactive functional groups, electron arrangement in the outermost energy level, and the nature of the chemical bonds.
For example, substances with high reactivity, such as alkali metals like sodium, readily react with water to form hydrogen gas and metal hydroxides. On the other hand, substances with low reactivity, such as noble gases like helium, are generally unreactive and have stable electron configurations.
Reactivity is an essential concept in chemistry as it helps predict and understand the behavior of substances in various chemical reactions.
Learn more about Reactivity