Help please with this tough question

Afamily is one another name for a group on the table of elements.

Which type of bonding involves the complete transfer of a valence electron from a less electrogrative atom to a more electronegative one

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?