If a light ray hits the back of the spoon at a 30 degree angle, the angle that the ray will reflect off the spoon is less than 30
30 degree
more than thirty degreese
unpredictable

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.