Assertion :According to Mendeleev, periodic properties of elements are periodic function of their atomic number. Reason: Atomic number is equal to the number of protons.

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Both Assertion and Reason are correct, but Reason is not the correct explanation of assertion.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion is correct but Reason is incorrect.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion is incorrect but Reason is correct.

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D Assertion is incorrect but Reason is correct.
According to Mendeleev, physical and chemical properties of elements are periodic function of their atomic weights (atomic masses).
Atomic number is equal to the number of protons. It is also equal to the number of electrons present in the neutral atom.
Assertion is incorrect but Reason is correct.

Suggest Corrections

Similar questions

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

Assertion: All the points (1, 0), (-1, 0), (2, 0) and (5, 0) lie on the x – axis.
Reason: Equation of the x-axis is y = 0

Choose the correct option.

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

{2n}^{2}

electrons.

Join BYJU'S Learning Program