In the Modern Periodic Table, which are the metals among the first ten elements ?

How could the Modern Periodic Table remove various anomalies of Mendeléev’s Periodic Table ?

Element $X$ forms a chloride with the formula $XCl_2$, which is a solid with a high melting point. $X$ would most likely be in the same group of the Periodic Table as

By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic ?

$Ga$         $Ge$        $As$        $Se$       $Be$

Use Mendeléev’s Periodic Table to predict the formulae for the oxides of the following elements :

$K,\, C,\, Al,\, Si,\, Ba$.

The position of three elements $A$, $B$ and $C$ in the Periodic Table are shown below

$(a)$ Will $C$ be larger or smaller in size than $B$ ?

$(b) $ Which type of ion, cation or anion, will be formed by element $A$ ?