BRAINCAKEPeriodicity
Revision notes for Periodicity in AQA Chemistry (7404). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.
- 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 rows in the periodic table acre 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 groups 1 to 14 (4) then there is a sharp decrease in melting point between group 4 and 5.
- 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 for, 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…