Answer:
hydrocarbons are the answer
Answer: The universe consists of all physical objects on earth in space
Explanation:
Answer:
The products react to reform the original reactants
E.g. Haber process of ammonia production
Elements which appear in the same column have similar properties (periodicity). For example, all of the elements in group XVII (17), the Halogens, all react in a similar fashion; they all like to attract one additional electron and form a -1 anion.
The Curies discovered radium