Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The oxide of the element with atomic number 11 is acidic, whereas the oxide of the element with atomic number 17 is basic. Reason (R): Across a period from left to right, the non-metallic character increases, which leads to an increase in the acidic character of the oxides. In the light of the abov

Step-by-step solution

The element with atomic number 11 is Sodium ( Na ), which is an alkali metal and forms a strongly basic oxide ( Na₂O ). The element with atomic number 17 is Chlorine ( Cl ), which is a halogen (non-metal) and forms highly acidic oxides (such as Cl₂O₇ ). Therefore, Assertion (A) is incorrect. Reason (R) is correct because as we move from left to right across a period, the effective nuclear charge increases and atomic size decreases, leading to an increase in non-metallic character. Non-metal oxides are generally aci