What 3 categories are consumers divided into

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0