In 1869, dmitri mendeleev was trying to arrange the 65 known elements in a logical way. he arrived at the solution when he saw the elements arranged by atomic weight in a dream. he tried this arrangement and it worked! what is this an example of?

Object a has a length of 3 cm, a width of 2 cm, and a height of 4 cm. object b is dropped into a graduated cylinder. it displaces 19 ml of water. the volume of object a is: a: greater than the volume of object b b: less than the volume of object b c: equal to the volume of object b