a. What is the general trend in first ionisation energies across Period 3? b. Explain why aluminium

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a. What is the general trend in first ionisation energies across Period 3?

b. Explain why aluminium has a lower first ionisation energy than magnesium.

c. Explain why sulfur has a lower first ionisation energy than phosphorus.

d. Look at Period 4 in the Periodic Table. 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.

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Cambridge International AS And A Level Chemistry Coursebook

ISBN: 9781316637739

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Authors: Lawrie Ryan, Roger Norris

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a. What is the general trend in first ionisation energies across Period 3? b. Explain why aluminium

Question:

p-block element Atomic First ionisation of Period 4 number energy / kJ mol-1 gallium (Ga) 31 577 germanium (Ge) 32 762 arsenic (As) 33 966 selenium (Se) 34 bromine (Br) 35 1140 krypton (Kr) 36 1350

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a The general trend in first ionisation energies across Period 3 from sodium to argon is that the fi...View the full answer

Cambridge International AS And A Level Chemistry Coursebook

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