If a potassium atom has an atomic number of 19 and a mass of 39 how many protons electrons and neutrons?
32. a helium -4 atom has twice as many protons as a hydrogen atom. how many protons and neutrons are in the nucleus?
33.the compound in blood that carries oxygen to cells throughout the body contains iron.iron has an atomic number of 26. iron -59 is used to diagnose disorders in the blood. how is iron -59 different from all other isotopes of iron? how it it the same?
34. scientists working in a field of nanotechnology use ether a top down or bottom up approach to construct tiny objects. give an example of a visual structure that was made using the top down approach
35. if you see a green color when fireworks explode can you be certain that the fireworks contained a barium compound? give a reason for your answer.