If K,L,M shells of an atom are completely filled with electrons, then : I) What would be the total number of electrons in the atom? &
2)Find its valency.
An atom of an element (X) has its K, L and M shells filled with some electrons. It reacts with sodium metal to form a compound NaX. The number of electrons in the valence shell of the atom (X) will be
Atoms are said to be completely filled when all the available shells are completely filled with electrons. Which of the following elements has completely filled outermost shell in its atoms?