4 What is the general trend in first ionisationenergies across Period 3?4aExplain why aluminium has a lower firstionisation energy than magnesium.Explain why sulfur has a lower first ionisationenergy than phosphorus.Look at Period 4 in the Periodic Table(Appendix 1)..The first ionisation energies of the p-blockelements are given in the table below.Predict the missing value for the first ionisationenergy of selenium.dbasp-block elementof Period 4AtomicFirst ionisationnumberenergy/ kJ mol-1gallium (Ga)31577germanium (Ge)32762arsenic (As)33966selenium (Se)34bromine (Br)351140361350krypton (Kr)Table 10.7: Information table for Question 4.

a. Ionization energy increases as a general trend across the left to right of period 3.

Answered: a why alumi W

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Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter20: The Representative Elements

Section: Chapter Questions

Problem 6RQ

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Question

What is the general trend in first ionisation
energies across Period 3?
4
a
Explain why aluminium has a lower first
ionisation energy than magnesium.
Explain why sulfur has a lower first ionisation
energy than phosphorus.
Look at Period 4 in the Periodic Table
(Appendix 1)..
The first ionisation energies of the p-block
elements are given in the table below.
Predict the missing value for the first ionisation
energy of selenium.
d
bas
p-block element
of Period 4
Atomic
First ionisation
number
energy/ kJ mol-1
gallium (Ga)
31
577
germanium (Ge)
32
762
arsenic (As)
33
966
selenium (Se)
34
bromine (Br)
35
1140
36
1350
krypton (Kr)
Table 10.7: Information table for Question 4.

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