OCR A Level Chemistry A – Module 2 Foundations in Chemistry
2.2.1
Electron Structure
Section 2.2.1 covers the electron shells, sub-shells and orbitals, the shapes of s and p orbitals, the filling rules and the electron configurations of atoms and ions up to krypton. One page covers the whole section.
Exam Paper
Paper 1 & 2
H432/01 and H432/02
Specification Points
2.2.1 (a) – (d)
4 learning outcomes
Topic Parts
1 of 1 live
Electron Configuration
Exam Board
OCR A
H432 (2015 onwards)
Specification Coverage
2.2.1 Electron Structure – OCR A Level Chemistry A
The following OCR A learning outcomes state what candidates should be able to do. Wording is taken from the OCR A Level Chemistry A (H432) specification.
2.2.1 Electron Structure
2.2.1(a)
Electron shells
i
the number of electrons that can fill the first shell
ii
the number of electrons that can fill the second shell
iii
the number of electrons that can fill the third shell
iv
the number of electrons that can fill the fourth shell
2.2.1(b)
Atomic orbitals and sub-shells
i
atomic orbitals as a region around the nucleus that can hold up to two electrons, with opposite spins
ii)-a
the shape of s-orbitals
ii)-b
the shape of p-orbitals
iii)-a
the number of orbitals making up s-sub-shells
iii)-b
the number of orbitals making up p-sub-shells
iii)-c
the number of orbitals making up d-sub-shells
iii)-d
the number of electrons that can fill s-sub-shells
iii)-e
the number of electrons that can fill p-sub-shells
iii)-f
the number of electrons that can fill d-sub-shells
2.2.1(c)
Filling of orbitals
i
filling of orbitals for the first three shells and the 4s and 4p orbitals in order of increasing energy
ii
filling of orbitals with the same energy, occupation singly before pairing
2.2.1(d)
Electron configurations
i
deduction of the electron configurations of atoms, given the atomic number, up to Z = 36
ii
deduction of the electron configurations of ions, given the atomic number and ionic charge, limited to s- and p-blocks up to Z = 36
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