2023 Structure of AtomSub-atomic Particles and Isotopes Medium Question 10 of 62 in Structure of Atom

Select the correct statements from the following: A. Atoms of all elements are composed of two fundamental particles. B. The mass of the electron is $9.10939\times10^{-31}$ kg. C. All the isotopes of a given element show same chemical properties. D. Protons and electrons are collectively known as nucleons. E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter. Choose the correct answer from the options given below:

A B, C and E only
B A, B and C only
C C, D and E only
D A and E only

The answer is A.

Solution

An atom has three fundamental particles; nucleons are protons and neutrons, so A and D are wrong.

An atom has three fundamental particles – electron, proton and neutron. The mass of the electron is $9.10939\times10^{-31}$ kg. Neutrons and protons, both are collectively known as nucleons. All the isotopes of a given element show same chemical properties. Dalton's atomic theory regarded atom as an ultimate particle of matter.

Concept fundamental particles and nucleons

Structure of Atom in past papers

62 questions from this chapter have appeared across 27 exam years.