Question

The radius of atomic nuclei is of the order of:
A. ${10^{ - 10}}cm$
B. ${10^{ - 13}}cm$
C. ${10^{ - 15}}cm$
D. ${10^{ - 8}}cm$

Answer 1

Hint: Atomic radius: The radius of atom is known as atomic radius.
Radius of an atomic nucleus is defined as the radius of the nucleus present in the atom.
As we know that in atom electrons are present which revolve in fixed orbit inside the atom and also in the atom nucleus is present in which the protons and the neutron are present. The electrons revolve in the fixed orbit inside the atom but outside the nucleus.

Complete step by step answer:
First we will read about atoms and its composition.
Atom: The smallest unit of an element is an atom which cannot be further divided into any other particle. All the elements are made of atoms which are of the same kind.
Atom is made up of three components: Electrons, protons and neutrons.
Electrons: They are the negatively charged particle in the atoms. They revolve in the fixed orbits inside the atoms.
Protons: They are the positively charged particle in the atoms. They are placed in a fixed room. That room is known as the nucleus. Nucleus is made up of protons and neutrons.
Neutrons: They are neutral in nature. They are placed in the nucleus along with the protons.
Since the number of electrons and protons are equal in number. So atoms are electrically neutral in nature i.e. have no charge.
Since, the nucleus is present inside the atom. So the size of an atom is more than that of the size of an atomic nucleus. Radius of an atom is about ${10^{ - 8}}cm$and the radius of atomic nucleus is about ${10^{ - 13}}cm$.

So, the correct answer is Option B .

Note:
 In the atom, nucleus is present hence it is obvious that the radius of atom will be greater than the radius of atomic nucleus. And also in comparison between atomic radius and radius of atomic nucleus, the radius of atomic nucleus is very small in size.