Question

Which of the following statements is not true about an atom?
A.Atoms are not able to exist independently.
B.Atoms are the basic units from which molecules and ions are formed.
C.Atoms are always neutral in nature.
D.Atoms aggregate in large numbers to form the matter that we can see, feel or touch.

Answer 1

Hint: The atomic structure consists of Atomic particles. Atoms consist of three basic particles, protons, electrons, and neutrons. The nucleus (center) of an atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and they contain the electrons.

Complete step by step answer:
Atoms can not exist independently. This is because atoms accept electrons or donate electrons to form stable octet fulfilled electronic configurations and this is only possible by formation of molecules. So atoms cannot exist along. But only inert gases already have octet fulfilled configurations so they can exist as atoms.
A molecule is formed by combining two or more than two atoms. These atoms can be the same or different. When all the atoms of a molecule are the same then it is called a homonuclear molecule and when all are different atoms then it is called heteronuclear molecule. When an atom accepts an electron or donates an electron it forms ions. The charge of the ion is directly proportional to the number of the electrons is accepted or donated.
Atoms have an equal number of protons which are positively charged particles and electrons which are negatively charged particles so this is neutral in nature.
Atoms are very small in size i.e. why it cannot be seen in naked eyes. But when atoms aggregate in large numbers to form the matter that we can see, feel or touch.
So, among the given options the first statement is not true.

So, the correct option is A.

Note: The first scientific theory of atomic structure was proposed by John Dalton in the 1800s. John Dalton suggested that all matter is made up of atoms, which were invisible and indestructible. He also stated that all the atoms of an element were the same, but the atoms of different elements differ in size and mass