Statement that when two elements combine with each other to from more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.
The most common allotropes are:-
White phosphorus
Red phosphorus
The red one is an intermediate phase between white and violent phosphorus.
A solid is hard and the molecules are packed together, a liquid can move around freely because the molecules aren't as packed together :)
The answer that fits the blank are ONE and TWO, respectively. Given Elliot's study or experiment, she has only one experimental group and one control group which brings to the fact that she has only one independent variable that has two groups.
