BRAINCAKEPeriodicity
Revision notes for Periodicity in AQA Chemistry (7404). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.
- The Periodic TableMendeleev arranged the (approx) 60 known elements in order of "atomic weight" in groups with similar properties and left gaps for undiscovered…
- Metals and Non-MetalsMetals are to the left of the staircase line on the periodic table.
- s, p, d and f BlockThe chemistry of each element is determined by its electron configuration, in particular, the number of electrons in the outermost (highest energy)…
- GroupsVertical columns on the periodic table are called groups.
- PeriodsThe horizontal rows in the periodic table are called periods.
- ReactivityReactivity of the s-block elements increases down the group.
- Hydrogen and HeliumDifferent tables place hydrogen in different places on the periodic table.
- Periodicity and Period 3 ElementsPeriodicity is the repeating trends in the properties of the elements across a period.
- Trends in Melting and Boiling PointsAcross periods 2 and 3, the melting point increases from group 1 to group 4 (group 14 in the current numbering) then there is a sharp decrease in…
- Atomic RadiiAtomic radii are a measure of the size of atoms.
- First Ionisation EnergyThe first ionisation energy is the energy required to remove one electron from each atom in one mole of gaseous atoms of an element to form one mole…
- Group 2 and 3Although there is a general trend in first ionisation energies across a period, and the ionisation energy increases across the period, except from…
- Group 5 and 6Although there is a general trend and the first ionisation energy increases across a period, the first ionisation energy falls from nitrogen to…
- Successive Ionisation EnergiesSuccessive ionisation energies increase because the remaining electrons are pulled closer to the nucleus after each electron is lost and the nuclear…
On the specification
- 3.2.1.1 Classification
- 3.2.1.2 Physical properties of Period 3 elements