An element has 8 electrons in the valence shell

An atom of an element has one electron in the valence shell and the two inner shells have 8 electrons each. Find the atomic number of that element.

What is the general name of the elements having 8 electrons in the valence shell of their atoms ?

What is the general name of the elements having 8 electrons in the valence shell of their atoms ?

An atom of element A has 3 electrons in its valence shell and an atom of B has 6 electrons in its valence shell. The formula of the compound between these two atoms will be :