Which of the following describes a chemical property of matter? a. Helium does not form compounds. b. Mercury will not soak into a paper towel. c. Table salt will dissolve in water. d. Water expands when it freezes.

Hydrogen is the most abundant element on the periodic table..hope it .

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

Rate law for this reaction israte of the reaction = k[a]²[b].second order in a  means concentration of a in power of two, and  first order in b means concentration of b in power of one.

The answer will be c