What is periodicity?
Periodicity is the trend in chemical and physical properties of the elements across each period of the periodic table.All elements in a period have the same number of shells, all elements in a group have the same number of electrons in their outer shells.Atomic radius decreases across a period and ionisation energy increases.However, there is a drop in ionisation energy between groups 2&3 and 5&6
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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.
Explain how the electron pair repulsion theory can be used to deduce the shape of, and the bond angle in, PF3 .
which element has a lower first ionisation energy, Magnesium or Aluminium?
Elements in the Periodic Table often show periodic trends. Describe and explain the periodic trend in atomic radius and electronegativity from Na to Cl.