In the atom of an element X, 6 electrons are present in the outermost shell. If it acquires noble gas configuration by accepting a requisite number of electrons, then what would be the charge on the ion so formed?

The charge on the ion formed is -2. The general outer valence shell electronic configuration of a noble gas is 2,6. Noble gas contains an entire octet in its valence shell and they have valency as zero. Given that there are 6 electrons in the valence shell of an atom of element X. 

To attain the noble gas configuration, two extra electrons are required. As a result, the element will receive two more electrons and develop a - 2 charge.