Explain the trend in atomic radii from Lithium to Fluorine?
As we go from Li to F, atomic radius of the atoms will DECREASE. This is due to increased nuclear charge (number of protons within each atom). Although the number of electrons also increases, each additional electron is placed within the same electron shell, so all the electrons are the same distance from the nucleus. This means the increased nuclear charge has a greater force of attraction on the electrons, drawing them closer to the nucleus, hence causing a decrease in atomic radius.
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Acid HA has a Ka of 2.00 x 10-4mol dm-3. A solution was made by adding 15cm3 of 0.34 M NaOH to 25cm3 of 0.45M HA. Calculate the moles and the concentration of A- and HA in this solution. Using the expression for Ka calculate the pH of the solution