The root-mean-square speed of a gas is found to be 391.2 m/s at 270 K. Which of

Question

The root-mean-square speed of a gas is found to be 391.2 m/s at 270 K. Which of the following is the gas? The change in energy of a one-electron atom or ion for an electronic transition from the initial energy level m to the final energy level nf is given by Which of the following species will have the longest wavelength emission line for the transition between the nx - 2 and m-1 levels? The mathematical description of an electron as a wave was developed by How many orbitals exist for the quantum numbers n = 4, 1=1? What is the orbital designation for an electron with the quantum numbers n = 3, I - 2? Which of the following properties is typically used to predict the type of bond that forms between two elements? In which bond does the Cl atom have the highest electron density? Which one of the following molecules or ions contains an exception to the octet rule?

Explanation / Answer

34) E

35) C (-1 0 +1 )

36) B ( since for l=2 the orbital is d)

37) A (The type of bonding between two elements can be conveniently predicted from their relative electronegativities.)

38) E (Bromine monochloride is very slightly polar because the electronegativities of bromine and chlorine are not the same. Thus, the electron density is higher)

39) A ( To satisfy the octect rule an atom has to have 8 electrons in the outer shell,but O2 has only 6 valence elctrons.The bonds should be 8-6=2 bonds,which need two more covalent bonds)

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