Which of Na+ and Mg2+ is the smaller ion. Explain your answer. (2 marks)
Mg2+ is the smaller ion. (1 mark) Mg2+ has a larger nuclear charge than Na+ and has the same number of electrons. (1 mark)
Further explaination: Magnesium is further along the period than sodium is which means that the electrostatic attraction between the valence electrons and the nucleus is greater than that of sodium and the relative nuclear charge for a 2+ ion is larger than that of a 1+ ion.
JH
Related Chemistry A Level answers
All answers ▸Q3. A third beaker, C, contains 100.0 cm^3 of 0.0125 mol/dm^3 ethanoic acid ( Ka = 1.74 × 10^−5 mol/dm^3 at 25 ºC). Write an expression for Ka and use it to calculate the pH of the ethanoic acid solution in beaker C.
What's the difference between an electrophile and a nucleophile?
Describe the process of oxygen transport via haemoglobin.
Ethanol can be made from the reaction between ethene and water. The reaction is exothermic and occurs at a high temperature. Describe and explain the effect of raising the temperature on the rate of achievement of equilibrium and the equilibrium yield.