(a)[2]
Fill in Table 2.1.
(b(i))[3]
Complete Table 2.2 so that it gives the number of electrons, neutrons and protons in one atom or ion of each of these isotopes.
(b(ii))[2]
Calculate the relative atomic mass of this potassium sample to one decimal place.
(b(iii))[1]
State what conclusion can be drawn from this information.
(c)[2]
Give the formula of one atom and one negative ion that share the same electronic configuration as Ca$^{2+}$.\n\natom\n\nnegative ion