Temperature would be the typical answer.
The number of protons (aka atomic number) determines the element or substance.
There isn't one, just a description. There are three descriptions; solid, liquid, & gas.
what you are trying to measure
The primary factor that determines which substance is most responsible for chemical reactions is the reactivity of the substances involved.
Mass is a measure of the total amount of matter in an object. It determines an object's resistance to changes in its state of motion. The SI unit for mass is the kilogram (kg).
Each individual state legislature determines the districts.
water
water
water
You use a ruler or tape measure to measure this in units of choice
The mean corpuscular volume is the measure that determines the average size of an erythrocyte. The erythrocyte is what is commonly known as red blood cells.
properties of matter that determine how a substance reacts with other substances