(a(i))[1]
Which element has a proton number smaller than lithium’s?
(a(ii))[1]
Which element is produced at the cathode when dilute sulfuric acid solution is electrolysed?
(a(iii))[1]
Which element has an oxide with formula $XO_2$ that is used for bleaching wood pulp?
(a(iv))[1]
Which element forms ions that give a white precipitate when tested with excess aqueous sodium hydroxide?
(a(v))[1]
Which element is extracted from bauxite?
(b(i))[2]
What does the term isotope mean?
(b(ii))[1]
How many neutrons are present in one atom of the isotope $^{204}_{80}\text{Hg}$?
(b(iii))[1]
How many protons are present in one atom of the isotope $^{204}_{80}\text{Hg}$?
(b(iv))[1]
Determine the number of electrons in the mercury(II) ion, $\text{Hg}^{2+}$.