I am a silvery white metal used to make salt

Find the protons, electrons and neutrons for strontium with a mass of 83

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Which metals are called noble metals