A sample of krypton is initially at a pressure of 62.1 atm and a temperature of 121.9 K. The pressure on the sample is reduced to 0.720 atm at a constant temperature of 121.9 K. Which of the following are true? a. One or more phase changes will occur
b. The sample is initially a solid
c. The final state of the substance is a liquid
d. The liquid initially present will vaporize
e. The sample is initially a gas

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

What is the maximum number of electrons that an atomic orbital can contain?

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.