This question is about periodicity, the Period 4 elements and their compounds - AQA - A-Level Chemistry - Question 3 - 2019 - Paper 1
Question 3
This question is about periodicity, the Period 4 elements and their compounds.
1. State the meaning of the term periodicity.
2. Identify the element in Period 4 wi... show full transcript
Worked Solution & Example Answer:This question is about periodicity, the Period 4 elements and their compounds - AQA - A-Level Chemistry - Question 3 - 2019 - Paper 1
Step 1
State the meaning of the term periodicity.
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Answer
Periodicity refers to the repeating patterns observed in the properties of elements as you move across a period in the periodic table. These patterns can include physical and chemical properties such as electronegativity, atomic radius, and ionization energy.
Step 2
Identify the element in Period 4 with the highest electronegativity value.
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Answer
The element in Period 4 with the highest electronegativity value is Bromine (Br). Electronegativity increases across a period due to increasing nuclear charge, which draws the bonding electrons closer.
Step 3
Identify the element in Period 4 with the largest atomic radius. Explain your answer.
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Answer
Element: Potassium (K).
Explanation: Potassium has the largest atomic radius in Period 4 due to its position on the left side of the periodic table. Atomic radius increases down a group and decreases across a period, and potassium has fewer protons than the other elements in Period 4, leading to less nuclear charge attracting the electrons.
Step 4
Name the property of arsenic(III) oxide that describes its ability to react in these two ways.
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Answer
The property of arsenic(III) oxide that describes its ability to react in these two ways is amphoteric. As an amphoteric oxide, it can react with both acids and bases.
Step 5
Complete the equation for the formation of arsenic hydride.
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Answer
The balanced chemical equation for the formation of arsenic hydride is:
