How is an atomic radius measured?

Which organic molecule is found in the chromatin of 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

The compound formed from 2 atoms of hydrogen and one atom of oxygen is