A. How many electron containing orbitals does Europium have? b. How many completely filled orbitals does Europium have?

c. How many paired electrons does Europium have?

d. How many partially filled orbitals does Europium have?

Water is a highly important natural resource. which of these would be the best method to conserve water? a) drinking bottled water b) monitoring the ph of rivers c) treating and re-using wastewater d) testing nitrate levels in groundwater