Study Questions 247b 32. How many subshells occur in the electron shell with the

Question

Study Questions 247b 32. How many subshells occur in the electron shell with the sible set of quantum numbers for an electron in an atom. 20. If energy is absorbed by a hydrogen atom in its ground state, the atom is excited to a higher energy state. For principal quantum number n-52 example, the excitation of an electron from n I te Which of theia wavelength of 102.6 nm require radis 33 Explain briefly why each of the following is not a por tion of longer wavelength than this? 34, Which of the following represent valid sets of quantum 21. Calculate the wavelength and frequency of light emitted when an electron changes from 3 to "-1 in the H atom. In what region of the spectrum is this radiation numbers? For a set that is invalid, explain briefly why it is not correct 22. Calculate the wavelength and frequency of light emitted 5. What is the maximum number of orbitals that can be when an electron changes from - 4tom-3 in the H atom. In what region of the spectrum is this radiation identified by each of the following sets of quantum numbers? When "sone" is the correct answer, explain your reasoning De Broglie and Matter Waves See Example 6.5 23. An electron moves with a velocity of 2.5 × 101 cm/s. 36. What is the maximum number of orbitals that can be What is 24. A beam of electroms ( identified by each of the following sets of quantum numbers? When "none" is the correct answer, explain 9.11 x 10- kglelectron) has an average speed of 13 x 10 m's. What is the wave length of electrons having this average speed? 25. Calculate the wavelength, in nanometers, associated with a46-g golf ball moving at 30. m/s (about 67 mphl. A what speed must the ball travel to have a wavelength of 5.6 10-3 nm? 7 Explain briefly why each of the following is not a pos sable set of quantum numbers for an electron in an atom In cach case, change the incorrect value (or values) to make the set valid. 26. A rifle bullet (mass 1.50 g) has a velocity of 7.00 x 101 mph (miles per hoar). What is the wave- length associated with this balleti Quantum Mechanics (See Sections 6-5-6-7.) 27. (a) When n-4, what are the possible values of (2 38. Explain briefly why each of the following is not a pos- sible set of quantum numbers for an electron in an atom. In each case, change the incoerect value (or values) to make the set valid. (b) When is 2, what are the possible values of m? (c) For a 4s orbital, what are the possible values of , (, and ? (d) For a 4f orbital, what are the possible values of , (, and m 2B. (a) When ,,-4, f-2, and mi,--1, to what orbital 39. State which of the following orbitals cannot exist accoed type does this refer? (Give the orbital label, such (b) How many orbitals occur in the n -5 electron shel!?40. State which of the following orbitals cannot exist accord ing to the quantem theory: 2s, 24, 3p, 3f, 4f, and Ss. Briefly explain your answers How many subshells? What are the letter labels of ing to the quantum theory: 3p. 4s, 2f, and 1p, Briefly the subsbells (c) How many orbitals occur in an f subshell? What are the values of m set of quantum numbers in, (, and m that quantum theory allows for each of the following orbitals: (a) 2p,(b) 3d, and (e) 4f 29. A possible excited state of the H atom has the electron in a 4p orbital. List all possible sets of quantum numbers m C, and me for this electron 42. Write a complese set of for each of the following orbitals: and 30. A possible excited state for the H atom has an electr in a Sd orbital. List all possible sets of quantum numbers n, (, and me for this electron. 43. A particular orbital has n- 4 and -2.What mast this orbital be: (a) 31. How many subshells occur in the electron shell with the principal quancum numbern4

Explanation / Answer

Ans 28 :

a) When n = 4 , l = 2 and ml= -1 , the orbital referred is 4d.

b) The number of orbitals in a shell can be given as n2 , where n is number of shell. So here for 5th shell , it will be 52 = 25 orbitals.

Subshells will also be 5 .

The letter labels of the subshells will be : s , p , d , f and g

c) There are 7 orbitals in the f subshell.

The values of ml are : -3 , -2 , -1 , 0 , +1 , +2 and +3

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