Which orbital is the first to fill with electrons in a given principal energy level

How many total atoms are in 0.45 gm of P2O5

Calculate the solubility (in g/L) of CaSO4 (s) in 0.500 M Na2SO4 (aq) at 25°C. The sp of CaSO4 is 4.93*10^-5.

What are all examples of biotic factors running log, stream water, dead leaves, bacteria, soil

Question 4 (higher question) Electrolysis of acidified water can produce hydrogen and oxygen. The apparatus for the electrolysis is: .

A sample of pure copper has a mass of 5 grams calculate its volume

The molar mass of water (H2O) is 18.02 g/mol. Yun needs 0.025 mol H2O for a laboratory experiment. She calculates that she needs 72.0 g H2O for the experiment. Yun's calculation was incorrect because she set up her unit conversion incorrectly.

I'm doing isotope homework and I need the find the number of protons, neutrons, and electrons first one is chromium-58 and chromium-63

Trisha and her lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. In one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid.

what mass of magnesium is required to react with excess nitrogen to produce 0.500 mol magnesium nitrade

Silver chromate is sparingly soluble in aqueous solutions. the ksp of ag2cro4 is 1.12 * 10-12 m3. what is the solubility (in mol/l) of silver chromate