Consider the following statements: (i) The discovery of inert gases...

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Consider the following statements:
(i) The discovery of inert gases later on did not disturb Mendeleev's arrangement.
(ii) In the present periodic table, periodicity in the properties of elements is related to the periodicity in their electronic configurations.
- Which of these statement(s) is/are correct ?
- (a) (i) only
(b) (ii) only
- (c) Both (i) and (ii)
(d) Neither (i) nor (ii)
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