Which of the following oxides is different from the other three oxides?

Given below are two statements:
Statement-$I$: Along the period,the chemical reactivity of the elements gradually increases from group $1$ to group $18$.
Statement-$II$: The nature of oxides formed by group $1$ elements is basic,while that of group $17$ elements is acidic.
In the light of the above statements,choose the most appropriate answer from the options given below:

Which elements of a group show anomalous behaviour? Explain with examples.

The element with atomic number $Z = 117$ should:

An atom of an element has an electronic configuration of $2, 8, 1$. Which of the following statements is correct?

Metallic nature and basic nature of the oxides $........$ as we move along a period.