3.Which is the correct formula for copper(II) phosphate? (A) Cu2PO4 (B) Cu3(PO4)2 (C) Cu2PO3 (D)Cu(PO4)2 (E) Cu(PO3)2

6.Calculate the wavelength of the light emitted by a hydrogen atom during a transition of its electron from the n = 4 to the n = 1 principal energy level. For hydrogen J(1/n2 ), C = 3 x108 m/s, h = 6.626 x JS. (A) 97.3 nm (B) 82.6 nm (C) 365 nm (D)0.612 nm (E) 6.8 nm