What is the name of an element that have a atomic number of 82 and the atomic number of 207

What are all substances made of?

What are the products in the following double-displacement reaction? CaCl2 + Na2CO3

Earth is part of the solar system. What objects make up our solar system?

Hydrogen gas + chlorine gas=hydrogen chloride skeleton equation

This type of heat transfer is trapped in green houses. Conduction, Convection, Or Radiation and why is it conduction, convection, or radiation?

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