Chemistry: Holiday HW
Class: 11AS
Date: 16 /04/2023
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2.
Why is the first ionisation energy of phosphorus greater than the first ionisation energy of
silicon?
A. A phosphorus atom has one more proton in its nucleus.
B. The atomic radius of a phosphorus atom is greater.
C. The outer electron in a phosphorus atom is more shielded.
D. The outer electron in a phosphorus atom is paired.
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10.
(a) Construct an equation to represent the first ionisation energy of oxygen.
include state symbols.
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[1]
(b) (i) State and explain the general trend in first ionisation energies across Period 2.
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[3]
(ii) Explain why ionisation energy A in Fig. 1.1 does not follow the general trend in first
ionisation energies across Period 2.
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