Which two body systems work together to deliever oxygen to the cells

Complete the table for ion charge based upon their losing or gaining electrons in the outer shell. (use the periodic table as necessary.) group most likely ionic charge # of valence electrons i +1 ii +2 iii +3 iv +4 or -4 v -3 vi -2 vii -1 viii 0

How manyatoms of mercury are in 1.4214e+1 ml sample

Determine the reaction and balance the following equations urgent due in the morning