Question

Introduction of neutron into the nuclear composition of an atom would lead to a change in
A.its atomic mass
B.its atomic number
C.the chemical nature of an atom
D.number of the electrons also

Answer 1

Atoms are made up of three fundamental particle proton, neutron and electron where proton having positive charge, electron having negative charge and neutron having no charge. Proton and neutron exist in the nucleus (centre) of an atom and electron revolves around the nucleus in specific orbit.

Complete step by step solution:
When we introduce the neutron into the nuclear composition of an atom, it would lead to change in the atomic mass of the atom. Atomic mass of an atom is defined as the sum of the number of neutrons and the number of protons in an atom.
Atomic mass $= no.\text{ }of\text{ }neutrons\text{ }+\text{ }no.\text{ }of\text{ }protons$

So, Option ‘A’ is correct answer i.e. its atomic mass

Additional information:
Atomic number: - Atomic number of an atom is defined as no. of proton or no. of electron present in an atom e.g. ${}_{11}^{23}Na$ where atomic number is $11$ and atomic mass is $23$. Atomic number of an atom represented by ‘Z’. Neutral atoms of each element contain an equal number of protons and electrons.

Note: The knowledge of fundamental particles of atoms when they lie in an atom, must the definition of atomic mass and atomic number also be clear to solve such kind of problem. Clear information about atomic numbers and atomic masses of different compounds. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.