Determine the number of protons, neutrons and electrons in the following ions and write their electron configurations using s pdf notation. (i) 58 Fe³+ (ii) 133 Cs+ (b) The following table contains information about the isotopes of selenium.

Given the following equation, calculate the theoretical yield of magnesium hydroxide(Mg(OH)2) that will be formed from 3 g of magnesium silicate (Mg2SiO4). 4 \mathrm{Mg}_{2} \mathrm{SiO}_{4}(\mathrm{~s})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{I}) \longrightarrow \mathrm{Mg}_{6}(\mathrm{OH})_{8}\left[\mathrm{Si}_{4} \mathrm{O}_{10}\right](\mathrm{s})+2 \mathrm{Mg}(\mathrm{OH})_{2} A solution of potassium hydroxide (KOH) is made by dissolving 2.5 g of potassium hydroxide in 30 mL of water. Calculate the concentration of the solution in mol dm-³(M). Balance the following chemical equations. \mathrm{SiH}_{3} \mathrm{Cl}(\mathrm{g})+\mathrm{NH}_{3}(\mathrm{~g}) \longrightarrow \mathrm{N}\left(\mathrm{SiH}_{3}\right)_{3}(\mathrm{~g})+\mathrm{NH}_{4} \mathrm{Cl}(\mathrm{s}) \mathrm{PdCl}_{2}\left(\mathrm{PPh}_{3}\right)_{2}(\mathrm{~s})+\mathrm{PPh}_{3}(\mathrm{~s})+\mathrm{N}_{2} \mathrm{H}_{4}(\mathrm{~g}) \longrightarrow \mathrm{Pd}\left(\mathrm{PPh}_{3}\right)_{4}(\mathrm{~s})+\mathrm{N}_{2}(\mathrm{~g})+\mathrm{N}_{2} \mathrm{H}_{5} \mathrm{Cl}(\mathrm{s}) Use VSEPR theory to predict the shape of phosphorus oxybromide (POBr3). In your answer you should show your workings, sketch the shape of the molecule, name the shape of the molecule and discuss any deviations from ideal geometry. g) Consider the following reaction: \mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}{ }^{2+}(\mathrm{aq})+3\left(\mathrm{HOCH}_{2} \mathrm{CH}_{2} \mathrm{OH}\right)(\mathrm{aq}) \longrightarrow \mathrm{Fe}\left(\mathrm{HOCH}_{2} \mathrm{CH}_{2} \mathrm{OH}\right)_{3}{ }^{2+}(\mathrm{aq})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) (i) Draw the expected structure of Fe(OHCH₂CH₂OH)3. (ii) Would you expect AH and AS for this reaction to be positive, negative or negligible. Carefully explain your answer. (h) Tritium (³H) is a radioactive isotope of hydrogen. Tritium undergoes beta decay and has a half life of 12.26 years. (i) Write a balanced nuclear equation for the preparation of tritium from the reaction of boron-10 (10B) with a neutron. (ii) Write a balanced nuclear equation for the decay of tritium. (iii) If a sample of tritium has a mass years?75 9₁ how much will be left after 98.08