Explain the contributions of Johann Dobereiner and John

Solution 3E:The formation of NaClSodium (electronic configuration : 2,8,1 ) has 1 electron more than a stable noble gas structure +(2,8). So it gave away that electron it would become more stable. Na has smaller in size due tothe removal of the electron from the last shell. Similarly Chlorine (electronic configuration :2,8,7) has 1 electron short of a stable noble gas structure (2,8,8). If it could gain an electron from -somewhere it too would become more stable.Whereas the size of Cl remain same and which is +bigger than Na . + (a) The smaller balls 2, 4,6 and 8 are Na ions. This is because the due to the removal of electrons from last shell. It reduces the size of the atom. Therefore, smaller red balls are + Na ion. -(b) The b