What's the atomic number of an atom that has 20 protons and 20 neutrons

Which two rocks usually consist of only one mineral, but may contain additional minerals?

Which is a restriction on both workers and producers that keeps the labor market from being a completely free market? workers' reluctance to move the reserve wage unemployment insurance the minimum wage

How many grams of ice could be melted by using 67,000 Joules of energy?

Convert 135 Meters to kilometers

How many co2 molecules are generated from each pyruvate molecule that enters the mitochondrial matrix?

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) zero.

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second? (Note that the half life of Uranium-238 is 4.468x109 years)

A base can neutralize an acid. true or false

Hydrochloric acid (12.0 ml of 0.233 m) is added to 296.0 ml of 0.0579 m ba (oh) 2 solution. what is the concentration of the excess h + or oh - ions left in this solution?

Which are the organs of the digestive system