| Be careful, be careful... anyone who knows the periodic table will think of "Group I" as the alkali metals (i.e. Lithium, Sodium, Potassium, Rubidium, Cesium, Francium) + hydrogen, as Group I is the first group (column) on the periodic table and hence the elements with 1 electron in their valence shell. I spend quite a bit of time puzzling over this. |