Where did all the elements in the universe come from?

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

What substance has a mass of 9.5g and volume of 2.1cm^3

What was bohr’s contribution to the planetary model