How many moles are 2.54×10^29 molecules of H20​

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

State the formula for density in words and mathematical symbols

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true