Question

What is atom ?
Define atomic mass unit?
What os modecules?
What is ion?
What is relency

Answer 1

Answer:

atom is the smallest particle of a chemical element that can exist.

atomic mass unit=a unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.

os modecules = A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms.

ion= an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

relevance =the quality or state of being closely connected or appropriate.

Answer 2

1 An atom is the smallest constituent unit of ordinary matter that has thde properties of a chemical element.

2 a unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.

3 A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. 

4 An ion is an atom or molecule that has a net electrical charge. 

5 i don't understand last question

But please make this answer as BRAINLIST