Do all elements pick up or lose valence electrons or are there exceptions?

What will most likely happen when two bromine atoms bond together?

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

A5.00 g of a in . g of at aa 5.00 g of b in . g of .?at .