Question

What could be the diameters of the molecules of matter?
A.${10}^{-5}m$
B.${10}^{-11}m$
C.${10}^{-9}m$
D.${10}^{-15}m$

Answer 1

Hint: To answer this question, we must understand the characteristics of molecules of matter. Covalent (chemical) bonds bind one or more atoms together to form molecules. Atoms are represented by circle shapes with a nucleus in the centre (containing protons and neutrons), surrounded by one or more concentric circles representing the atom's "shells" or "levels" in which the electrons surrounding the nucleus are located, and markings indicating the electron at each level.

Complete answer:
A molecule is the smallest unit of a substance that holds the compound's chemical properties. Molecules are made up of atoms arranged in groups. An atom's structure is also subdivided into smaller components when describing it. An atom's sub-particles are protons, electrons, and neutrons. Protons and neutrons are confined within the nucleus of the atom, which is surrounded by electrons.
Water is a simple molecule made up of only a few atoms. The atoms of basic molecular compounds are held together by strong covalent bonds. Despite this, weak forces link the molecules together, resulting in high melting and boiling temperatures.
A simple molecule has a diameter lying in the range 0.4 to 2 nm.
A macromolecule has a diameter lying in the range 5 to 25 nm.
So, the correct answer is (C) ${10}^{-9}m$.

Note:
An atom is exceedingly small, much smaller than our imagination allows us to imagine. When more than millions of atoms are packed together, a layer of an atom the thickness of a thin sheet of paper is created. Because it's difficult to detect the positions of electrons surrounding the nucleus, measuring the size of an isolated atom is impossible.