Question

The size of the nucleus is measured in ______ units.
A.a.m.u
B.Angstrom
C.Fermi
D.cm

Answer 1

We know that an atom consists of positive charge nucleus, with negatively charged particles called as electrons surrounding the nucleus. We also know that the atomic nucleus consists of protons and neutrons present in them.

Complete step by step answer:
Based on results of the gold foil experiment, the protons and neutrons are present inside a small, dense region present at the center of the atom called a nucleus.
We know that the neutrons and protons are present inside the nucleus. The neutron and protons are collectively called nucleons.
We know that the atom contains positively charged nucleus present at its center and negatively charged particles known as electrons, which revolves around the nucleus in circulating paths called as orbitals. The nucleus and electrons are bound together by the means of electrostatic force.
The mass of the atom is concentrated in the nucleus with a small part from the cloud of electrons.
The nuclear diameter lies in the range of $1.7566 \times {10^{ - 15}}\,m$ for hydrogen (diameter of a single proton) to about $11.7142 \times {10^{ - 15}}\,m$ for uranium.
We know that ${10^{ - 15}}m$ is equal to one fermi (fm).
$1\,fm = {10^{ - 15}}\,m$
$\therefore$ Option (C) is correct.
In the given options,
a.m.u stands for atomic mass unit, which is the mass of an atom. $\therefore$ Option (A) is incorrect.
Angstrom is ${10^{ - 10}}\,m$. $\therefore$Option (B) is wrong.
cm is ${10^{ - 2}}\,m$. $\therefore$ Option (D) is wrong.
The size of the nucleus is measured in Fermi units, which is ${10^{ - 15}}\,m$.

Note:
We know the branch of chemistry that deals with atomic nucleus as nuclear chemistry. Strong nuclear force also holds the nucleus tightly. We know that the isotope of an atom is according to the number of neutrons present in the nucleus. Some models of the nucleus include:
1.The Liquid drop model
2.The nuclear shell model