Why is the atomic number considered a better fundamental attribute of an element than the mass number? State the reason.

Vedclass pdf generator app on play store
Vedclass iOS app on app store
(N/A) The atomic number is considered a more fundamental attribute because it represents the number of protons in the nucleus of an atom,which uniquely defines the identity of an element.
Unlike the mass number,which can vary due to the presence of different numbers of neutrons (isotopes),the number of protons remains constant for all atoms of a specific element.
Furthermore,the chemical properties of an element are primarily determined by its electronic configuration,which is directly dictated by the atomic number (number of protons/electrons in a neutral atom).

Explore More

Similar Questions

State whether the following statement is true or false:
The relative atomic masses of all elements have been found with respect to an atom of oxygen-$16$.

$(a)$ Explain Bohr$-$Bury rules for the distribution of electrons into different shells.
$(b)$ Write the electronic configuration of an atom of sulphur. Also,draw a schematic diagram of its atom showing the distribution of electrons in its shells.

$(a)$ Explain why did Rutherford select a gold foil in his alpha scattering experiments?
$(b)$ What observations in $\alpha$-scattering experiment led Rutherford to make the following conclusions?
$(i)$ Most of the space in an atom is empty.
$(ii)$ Nucleus is positively charged.
$(c)$ Mention any two drawbacks of Rutherford's model.

Calculate the number of neutrons present in the nucleus of an element $X$ which is represented as $^{31}_{15}X$.

Two elements are denoted as follows:
$_{20}^{40}A$ and $_{18}^{40}B$
$(a)$ Find the number of electrons present in $A$ and $B$.
$(b)$ Find the number of nucleons present in $A$ and $B$.
$(c)$ Explain the special 'term' used to represent $A$ and $B$ and define the same.

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo