How do you know where the metals are in the periodic table

What’s a special glass that most beakers are made of

What is the number of atoms in 3.54 mol s

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