4. Fill in the blank with correct words: points) a) Infrared radiation has energ

Question

4. Fill in the blank with correct words: points) a) Infrared radiation has energy and wavelength compared b) Bohr's theory of the hydrogen atom had electrons going around the nuclei in mechanical calculations agreed with Bohr's theory that the electrons c) Quantum d) Heisenberg said that if one knew the precise momentum of a particle there must be some uncertainty in its subshells are e) When n 2, the values of can be and the subshell and respectively. When a subshell is labeled f, there are values of mu, and orbitals occur within the subshell. 5. Give the maximum number of orbitals that can be identified by each of the following sets of quantum numbers. When "none" is the answer, explain your (4 points) maximum number of orbitals a) n 4, 1-3 c) n 2, 1-2

Explanation / Answer

(4)

(a) Infrared radiation has less energy and more wavelength compared to ultraviolet radiation.

(b) Bohr's theory of hydrogen atom had electrons going around the nuclei in fixed circular paths called orbits.

(c) Quantum mechanical model agreed with Bohr's model that the electron are in stationary levels.

(d) Heisenberg said that if one knew the precise momentum of a particle there must be some uncertainity in its position.

(e) When n = 2, the values of 'l' can be 0 and 1, and the subshells are called a 's' subshell and a 'p' subshell respectively.

Reason: Forn given n value l has the values from 0 to (n-1)

(f) When a subshell is labled 'f', there are 7 values of ml and 7 orbitals occur with in the subshell.

Reason: For a given subshell ml has the values from +l to -l amd total number of ml values indicate number of orbitals.

(5)

(a) n= 4, l = 3 indiates '4f' subshell and it has 7 orbitals.

(b) n = 5, for a given shell maximum number of orbitals = n2 = 52 = 25.

(c) n = 2, l = 2 indicates '2p' subshell and it has 3 orbitals.

(d) n = 3, l = 1, ml = -1 indicates 3pz orbital and is the only orbital it contains.

(e) n = 3, l = 0, ml = +1, it is the correct set of quantum numbers, it has no orbitals.

Reason: n = 3, l = 0 combination indicates '3s' subshell, and for l = 0 subshell, ml has only one value that is 0. Hence ml = +1 is not possible.

(f) n = 5, l = 1 indicates '5p' subshell and it has 3 orbitals.

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