9) Which of the following wavelength and greatest energy? A) ultraviolet radiati

Question

9) Which of the following wavelength and greatest energy? A) ultraviolet radiation sources from the electromagnetic spectrum has the shortest B) radio C) visible D) microwave a 10) The ground-state electron configuration of the element A) Cr is [Kr]5s14ds B) Nb C) Te D) Mn E) Mo 11) An electron cannot have the quantum numbers n- A) 3,2,1 B) 1,0,0 )3,2,3D) 3,2,2 6,1, 12) The energy (U) required for an electronic transition in a Bohr hydrogen atom from n- 1 to A) 1.94 × 10-18 D) 3.00× 10-19 B) 8.90 x 10-1 E)-8.90 x 10-1 C)-3.00 x 10-19 13) Which electron configuration represents a violation of Hund's rule for an atom in state? A) 1s 2s 2p B) 1s C) 1s 2s D) 1s 2s 2p E) 1s 2s

Explanation / Answer

I am solving the first four problems as per Chegg guidelines, post multiple question to get the remaining answers

Q9)

Correct answer is Option E

Gamma rays has the shortest wavelength of the order 10^(-20)m, since wavelength is inversely proportional to Energy, hence the highest energy will be by gamma rays

Q10)

The correct answer is Option E

Mo (Molybednum) belongs to the fifth period in the group of Chromium exhibiting the 4s1 5d5 configuration because of additional stability of half filled orbitals

Q11)

The correct answer is Option C

The value of ml cannot exceed the value of l quantum number (3,2,3) is hence a wrong set

Q12)

Energy = -13.6 * (1/3^2 - 1/1^2)

=> 13.6 * 8/9 eV

=> 15.3 eV = 15.3 * 1.6 * 10^(-19) J

=> 1.934 * 10^(-18) J

Hence the correct answer is Option A

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