Question

which group of the periodic table is the following element found in? ar4s²3d²

Explanation:

Step1: Identify valence - electrons

The electron - configuration is $[Ar]4s^{2}3d^{2}$. The valence electrons are in the $4s$ and $3d$ orbitals. The number of valence electrons is the sum of electrons in the outermost $s$ and $d$ orbitals. Here, the number of electrons in $4s$ is 2 and in $3d$ is 2, so the total number of valence electrons is $2 + 2=4$.

Step2: Determine the group number

For transition metals (elements with partially filled $d$ - orbitals), the group number is equal to the sum of the number of electrons in the outermost $s$ and $d$ orbitals. Since the total number of valence electrons ($4s$ and $3d$ electrons) is 4, the element is in group 4 of the periodic table.

Answer:

Group 4