estimate the ground state energy of the hydrogen atom. How different is this from the actual ground-state energy

What is the formula that this ionic compounds could form sr2+p3-o2-

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

Nan element’s square on the periodic table, the number with the greatest numerical value represents the