$Mg$ and $Li$ are similar in their properties due to

The correct order of increasing metallic character of $Na$, $Be$, $P$, $Mg$ and $Si$ is:

Which one of the following combinations represents a metallic element?

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 of the following electronic configurations represents a coinage metal?

Why do elements in the same group have similar physical and chemical properties?