CAIE A-Level Chemistry 1.3.2 Numbers of s, p and d Orbitals

Practise converting between sub-shell type, number of orbitals and maximum number of electrons.

Exam points

state that s, p and d sub-shells contain 1, 3 and 5 orbitals respectively
use a maximum of two electrons per orbital to obtain capacities of 2, 6 and 10 electrons
count occupied orbitals separately from electrons when reading a configuration or box diagram

[Maximum number: 4]

Atoms contain the subatomic particles electrons, protons and neutrons. Protons and electrons were discovered by observations of their behaviours in electric fields.

(a)

Electrons in atoms up to ${ }_{36} \mathrm{Kr}$ are distributed in s, p and dorbitals.

[ 4 ]

(i)

State the number of occupied orbitals in an isolated atom of ${ }_{36} \mathrm{Kr}$ .

Table for Question (i) — CAIE A-Level Chemistry AS

[ 3 ]

(ii)

The diagram shows a type of orbital.

Figure for Question (ii) — CAIE A-Level Chemistry AS

State the total number of electrons that exist in all orbitals of this type in an atom of ${ }_{9} \mathrm{~F}$ .

[ 1 ]

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1.3.2—Number of orbitals making up s, p and d question 1

Question (a)

Question (i)

Question (ii)