Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 2 to n = 1.

The first element on the periodic table of elements is carbon. a. true b. false

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

Connect the whole numbers on the periodic table to indicate what they represent?