This shows that lithium atoms have three electrons, two in the first shell and one in the second shell. Sodium has 11 ... an atom must gain or lose to achieve the same electronic structure as ...

(London and Toronto: Hodder and Stoughton, Ltd., 1923.) 2s. 6d. net. (2) The Atom and the Bohr Theory of its Structure: an Elementary Presentation. By H. A. Kramers Helge Holst. Translated from ...