Identify what $[\text{Ar}]$ means by giving its full electronic configuration.
The electrons with the lowest energy in cobalt are located in the $1s$ orbital. Draw the shape of a $1s$ orbital.
Deduce how many unpaired electrons are present in a cobalt atom.
Table 1.1 contains some details about the stable naturally occurring isotopes of rhodium and iridium. Complete Table 1.1.
Define relative isotopic mass.
Use Table 1.2 to work out the relative atomic mass, $A_r$, of iridium in the alloy. Give your answer to two decimal places.
Hydrated rhodium(III) chloride contains $20.5\%$ by mass of water of crystallisation. Determine the integer value of $x$ in $\text{RhCl}_3 \cdot x\text{H}_2\text{O}$. Show your working.
Define stereoisomers.
Explain how the conversion of ethene to but-2-ene can be described as an addition reaction.
Draw the two stereoisomers of but-2-ene.