What is the energy in kj for an x-ray photon with a frequency of 2.4x10 to the 18 power s-1

Draw the lewis dot structure for each of the following polyatomic ions

Calculate the molarity of each aqueous solution: a. 78.0 ml of 0.240 m naoh diluted to 0.250 l with water b. 38.5 ml of 1.2 m hno3 diluted to 0.130 l with water

Which of the following are in a chemical family a. ca, sc, k b. cu, ag, au c. so, ge, sb