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Assertion: According to Mendeleeff, periodic properties of elements is a function of their atomic masses. Reason : Atomic number is equal to number of protons

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

Which of the following compound has/have effective atomic number equal to the atomic number of a noble gas?

Which of the following compound has/have effective atomic number equal to the atomic number of a noble gas ?

Which of the following compound has/have effective atomic number equal to the atomic number of a noble gas?