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) Complete the sentenc... 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
The particle that allowed for the arrangement is the proton.
Step 3
Which one of the nine elements shown in Figure 4 has the lowest boiling point?
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Answer
The element with the lowest boiling point is 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 has a higher density than 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 reactivity of Group 1 elements increases down the group due to the increasing distance from the nucleus, which results in weaker attraction to the valence electron as the number of electron shells increases. Conversely, in Group 7, the reactivity decreases down the group because the relative distance from the nucleus increases. This makes it harder for larger atoms to attract additional electrons to form negative ions, which is essential for their reactivity.
