This question is about elements and the periodic table - AQA - GCSE Chemistry - Question 3 - 2016 - Paper 3
Question 3
This question is about elements and the periodic table.
3 (a) Newlands and Mendeleev both produced early versions of the periodic table.
3 (a) (i) Complete the sen... show full transcript
Worked Solution & Example Answer:This question is about elements and the periodic table - AQA - GCSE Chemistry - Question 3 - 2016 - Paper 3
Step 1
Complete the sentence.
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Answer
In their periodic tables, Newlands and Mendeleev arranged the elements in order of atomic weights.
Step 2
Name the particle that allowed the elements to be arranged in order of their atomic number in the modern periodic table.
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Answer
Proton.
Step 3
Which one of the nine elements shown in Figure 4 has the lowest boiling point?
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Answer
F (Fluorine).
Step 4
Give one other difference between the properties of copper and potassium.
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Answer
One difference is that copper is a stronger material compared to potassium.
Step 5
Explain why the reactivity of the elements increases going down Group 1 from lithium to rubidium but decreases going down Group 7 from fluorine to iodine.
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Answer
The increase in reactivity down Group 1 is due to the relative distance from the nucleus, which causes the outer electron to be less tightly held and more easily lost. In contrast, the decrease in reactivity down Group 7 arises from the relative increase in atomic size, which results in a weaker attraction between the nucleus and the incoming electron. Furthermore, there is more shielding effect from the inner shells in larger atoms, making halogens like iodine less reactive than fluorine.
