Question

What is atom?
What is molecule?
what is chemical reaction?
explain it.
​

Answer 1

Answer:

atom is smallest particle of element...

molecule is smallest particle of compounds

chemical reaction is process of forming new substance by chemical change. ..

Explanation:

here is your answer.

Answer 2

Answer: An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.

A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge.

Chemical reactions are the processes in which new substances with new properties are formed. Example: When magnesium ribbon is heated, it burns in air to form a white powder called magnesium oxide. Mg+21O2→MgO.