Compound X contains two elements, Y and Z . Element $$$Y$$$ is in Period 2 of the Periodic Table. In one atom of element $$$Y$$$, the $$$p$$$ sub-shell has all three orbitals occupied; only one of these three orbitals is fully occupied. Element $$$Z$$$ is in Period 3 of the Periodic Table. In one atom of element $$$Z$$$, the $$$p$$$ sub-shell has only two orbitals occupied. What is the formula of compound X ?

$\mathrm{CCl}_{4}$

$\mathrm{SiCl}_{4}$

$\mathrm{SiO}_{2}$

$\mathrm{SO}_{2}$

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_w24_qp_11 Year：2024 Question No：2

Answer:

Knowledge points:

1.3.1.1 shells, sub-shells and orbitals

1.3.1.2 principal quantum number (n)

1.3.1.3 ground state, limited to electronic configuration

1.3.2 describe the number of orbitals making up s, p and d sub-shells, and the number of electrons that can fill s, p and d sub-shells

1.3.3 describe the order of increasing energy of the sub-shells within the first three shells and the 4s and 4p sub-shells

1.3.4 describe the electronic configurations to include the number of electrons in each shell, sub-shell and orbital

1.3.5 explain the electronic configurations in terms of energy of the electrons and inter-electron repulsion

1.3.6 determine the electronic configuration of atoms and ions given the atomic or proton number and charge, using either of the following conventions

1.3.7 understand and use the electrons in boxes notation

1.3.8 describe and sketch the shapes of s and p orbitals describe a free radical as a species with one or more unpaired electrons

9.1.1 describe qualitatively (and indicate the periodicity in) the variations in atomic radius, ionic radius, melting point and electrical conductivity of the elements

9.1.2 explain the variation in melting point and electrical conductivity in terms of the structure and bonding of the elements

Answer:

Knowledge points:

Solution:

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