(a)[2]
Give two further ways in which the physical properties of chromium are different from those of potassium.
(b(i))[1]
Choose a word from the list that best describes the nickel rod: anode, cathode, cation, electrolyte, mixture.
(b(ii))[1]
One use of electroplating is to improve appearance. Describe one different reason for electroplating an object.
(c)[2]
Deduce the number of electrons and neutrons in one atom of the chromium isotope shown, $^{54}_{24}\text{Cr}$.
(d)[2]
Complete the table so that the relative molecular mass of CrH$_2$O$_6$ can be calculated.
(e)[2]
Put the four metals into reactivity order, with the least reactive first.