Determine the numbers of protons, neutrons and electrons in one atom of manganese-55.
Define isotopes in terms of atomic structure.
A sample of manganese from the Moon is discovered to contain manganese-53 as well as manganese-55. State the two pieces of information needed to determine the relative atomic mass, $A_r$, of manganese in this sample.
Complete the full electronic configuration of manganese from the shorthand configuration $[\mathrm{Ar}]\,3d^5\,4s^2$.
Deduce the total number of unpaired electrons in one atom of manganese.
Manganese(IV) oxide reacts with methanal, $\mathrm{CH_2O}$, under acidic conditions to form carbon dioxide. Electron transfer to or from the relevant species is shown in the half-equations below: Half-equation 1: $\mathrm{CH_2O + H_2O \rightarrow CO_2 + 4H^+ + 4e^-}$; Half-equation 2: $\mathrm{MnO_2 + 4H^+ + 2e^- \rightarrow Mn^{2+} + 2H_2O}$. Identify the species that is reduced in half-equation 2. Explain your answer.
Given that carbon in methanal has oxidation state 0, Calculate the oxidation state of carbon in carbon dioxide.
Construct the ionic equation for the reaction of manganese(IV) oxide with methanal in acidic conditions.