(A) : According to Mendeleeff, periodic properties of elements is a function of their atomic masses.
(R) : Atomic number is equal to number of protons

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Both A and R are true and R is the correct
explanation

Both A and R are true but R is not the
correct explanation of A

A is true but R is false

A is false but R is true

answer is D.

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Detailed Solution

According to Mendeleev, the physical and chemical properties of elements are periodic functions of their atomic weights (atomic masses).

The atomic number is equal to the number of protons present in the atom Additionally, it is equivalent to the neutral atom's total amount of electrons.

Therefore Option D is the correct answer

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