Electron configurations of atoms and ions

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.

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

(i) State the electron configuration of a nitrogen atom. (ii) Draw the Lewis formula of ammonia. (iii) Deduce the electron domain geometry and the molecular geometry of the ammonia molecule. (iv) Explain why the ammonia molecule is polar.

Which electron configuration is correct for a chromium atom, Cr, in its ground state? A. $\mathrm{[Ar]\,4s^1\,3d^5}$ B. $\mathrm{[Ar]\,4s^2\,3d^4}$ C. $\mathrm{[Ar]\,3d^6}$ D. $\mathrm{[Ar]\,4s^2\,4d^4}$

What is the electron configuration of the $\ce{Co^2+}$ ion? A. $\ce{[Ar] 3d^7}$ B. $\ce{[Ar] 4s^2 3d^5}$ C. $\ce{[Ar] 4s^1 3d^6}$ D. $\ce{[Ar] 4s^2 3d^7}$

(i) The boxes for the 1s and 2s orbitals of a sulfur atom are shown below. Draw the remaining orbitals needed for its ground-state electron configuration, filling and labelling each one. Use section 7 of the data booklet. (ii) For a sulfur atom, sketch the…

The diagrams show the 3s and 3p sublevels of a sulfur atom; the inner sublevels are full. Which diagram represents the ground-state electron configuration, in agreement with the Pauli exclusion principle and Hund's rule? A. Diagram A B. Diagram B C. Diagram C…

Anhydrous nickel(II) chloride is yellow, whereas magnesium chloride is white. (i) State nickel's condensed electron configuration. (ii) In terms of electron configuration, state why nickel(II) chloride is a coloured compound. (iii) Nickel(II) chloride absorbs…