Electron configurations

What is the correct electron configuration of the selenium atom? A. $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^4$ B. $1s^2 2s^2 2p^6 2d^{10} 3s^2 3p^6 4s^2 4p^4$ C. $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6$ D. $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{8} 4s^2 4p^6$

Successive ionization energies of an element: Ionization energy number Energy / kJ mol⁻¹ 1st 738 2nd 1451 3rd 7733 4th 10 540 5th 13 630 6th 17 995 7th 21 704 8th 25 656 9th 31 643 10th 35 461 Which element has these successive ionization energies? A. Sodium…

Calculate the wavelength, in m, of the limit of convergence in the line emission spectrum of tin. Use sections 1, 2 and 9 of the data booklet.

Portions of the rinse water were then titrated with the standardized EDTA solution in the presence of murexide as indicator. The burette readings are given in the table. Trial 1 Trial 2 Trial 3 Trial 4 Final burette reading / $\mathrm{cm^3}$ (± 0.05…

The letters below stand for four species, not for element symbols. Which pair of species has an identical number of outer-shell electrons? $\ce{^{31}_{15}J^{2-}}$, $\ce{^{40}_{18}L^{+}}$, $\ce{^{39}_{19}M^{+}}$, $\ce{^{32}_{16}Q^{2+}}$ A. J and M B. L and Q C.…

Deduce the electron configuration of the $\ce{Fe^3+}$ ion.

Gallium was discovered in 1875 from its atomic emission spectrum, which contains two strong violet lines. (i) State which feature of an emission spectrum allows the ionization energy of the element to be determined. (ii) Using sections 1, 2 and 9 of the data…

What is the maximum number of electrons that can occupy the n = 4 main energy level? A. 8 B. 16 C. 18 D. 32

Which diagram shows the electron configuration of an oxygen atom in its ground state? A. Diagram A B. Diagram B C. Diagram C D. Diagram D

The successive ionization energies of an element are plotted against the number of the ionization. What is the group number of the element? A. 2 B. 3 C. 13 D. 14