Question

question: based on the picture, define the following words.
a. atom (an atom is...)
b. molecule (a molecule is...)
c. compound (a compound is...)
d. mixture (a mixture is...)

Explanation:

a. An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus (protons and neutrons) surrounded by electrons.
b. A molecule is a group of two or more atoms held together by chemical bonds.
c. A compound is a substance made up of two or more different - element atoms chemically combined in a fixed ratio.
d. A mixture is a combination of two or more substances that are not chemically combined and can be separated by physical means.

Answer:

a. The smallest unit of matter that retains the properties of an element, consisting of a nucleus and electrons.
b. A group of two or more atoms held together by chemical bonds.
c. A substance made up of two or more different - element atoms chemically combined in a fixed ratio.
d. A combination of two or more substances that are not chemically combined and can be separated by physical means.