What element has 2 energy levels and 1 valance electrons

Robert wants to know which fertilizer will work the best for his grass. what can he do to explore this inquiry?

Anurse is preparing to administer ampicillin 500 mg in 50 ml of dextrose 5% in water (d5w) to infuse over 15 min. the drop factor of the manual iv tubing is 10 gtt/ml. the nurse should set the manual iv infusion to deliver how many gtt/min? (round the answer to the nearest whole number. use a leading zero if it applies. do not use a trailing zero.)

All ova contain sex chromosomes corresponding to: x y xx xy