Which set of elements has physical and chemical properties similar to phosphorus? Aluminum, silicon, sulfur, & chlorine, , ,

Carbon, selenium, iodine, & radon

Oxygen, germanium, indium & mercury

Nitrogen, arsenic, antimony & bismuth

The number at the end of an isotope’s name is the number.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.