16. What is the energy of a photon with a wavelength Q) of 486 nm? (A) 3.22x10-\

Question

16. What is the energy of a photon with a wavelength Q) of 486 nm? (A) 3.22x10-" (C) 1.07×10-19J Which is an allowed set of quantum numbers for a 4d (B) 4.09× 10-28 J (D) 4,0% 10-19 J 17. electron in the ground state of cadmium? n m m (A) 4 2 +2 +½ (B) 4 2 +3 +½ (C) 4 3-3+½ (D) 4 3 0 +½ 8. The energy of an electron in a multi-electron atom is determined by (A) the principle quantum number, n, only (B) the angular momentum quantum number, t, only (C) the principle and angular momentum quantum numbers, n and t the principle, angular momentum and magnetic quantum numbers, n, (, and m, (D) 19. To what element does this orbital diagram correspond? 1s 2s 2p 3s (A) Br (B) C (C) Mn (D) P What is the ground state electron configuration of the 3p 20. Mn2"ion? (A) (Ar]3d (C) [Arj4s 3d (B) [Ar]4s 3d (D) [Arj4s 3d 21. Which atom has the highest effective nuclear charge, Zeff for its valence electrons? (A) Ca (B) Mg (C) P (D)S

Explanation / Answer

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16)B E=4.09 x10^-28

The amount of energy in those photons is calculated by this equation, E = hf, where E is the energy of thephoton in Joules; h is Planck's constant, which is always 6.63 * 10^-34 Joule seconds; and f is the frequency of the light in hertz or E= hc/wavelength(c=speed of light in vaccum which is =3*10^8m/s)

hence E=6.63* 10^-34 x (3*10^8 /486)

E=4.09 x10^-28

17) A is the answer

Each electron has its unique set of quantum numbers,

18)c It depends on the principalquantum number and the l

19)this is the electronic configuration of chlorine Cl (35)

please ask the questions separately

4d orbital is given

So, the principal quantum number, n, describes the energy level on which the electron is located. In this case, you have

n=4 the electron is located on the fourth energy level

The subshell in which the electron is located is described by the angular magnetic quantum number, l, which for the fourth energy level takes the following values

Since you're looking for the d-subshell, you will need l=2.( hence d is not the answer)

The specific orbital in which the electron is located is given by the magnetic quantum number, ml. For any d-subshell, the magnetic quantum number can take the values

ml={2,1,0,+1,+2}

Each of these five values describes one of the five d-orbitals available in a d-subshell.( hence b and c are wrong)

Finally ,the spin quantum number, ms, can only take two values, 1/2 for an electron that has spin-down and +1/2 for an electron that has spin-up.

hence A is the answer

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