Chemistry · Structure of Atom

NEET (UG) 2023 — Question 59

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 $9.10939 \times 10^{-31} \mathrm{~kg}$ .

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.

In the light of the above statements, choose the most appropriate answer from the options given below:

Answer: C

A is False: Atoms are composed of three fundamental particles (electrons, protons and neutrons), not two.

B is True: The mass of the electron is $9.10939 \times 10^{-31} \mathrm{~kg}$ .

C is True: All isotopes of an element have the same electronic configuration, hence show same chemical properties.

D is False: Nucleons are protons and neutrons, not electrons.

E is True: Dalton’s atomic theory regarded the atom as the ultimate indivisible particle of matter.

Therefore, the correct statements are B, C and E.

Answer key and solution verified before publishing.

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