This question is about the periodic table - AQA - GCSE Chemistry Combined Science - Question 1 - 2021 - Paper 1
Question 1
This question is about the periodic table.
Figure 1 shows part of Mendeleev's version of the periodic table.
Which group of elements had not been discovered when M... show full transcript
Worked Solution & Example Answer:This question is about the periodic table - AQA - GCSE Chemistry Combined Science - Question 1 - 2021 - Paper 1
Step 1
Which group of elements had not been discovered when Mendeleev's version of the periodic table was published?
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Answer
The group of elements that had not been discovered at the time of Mendeleev’s publication is the noble gases, which correspond to Group 0.
Step 2
Which model represents the plum pudding model?
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Answer
The model that represents the plum pudding model is B.
Step 3
Which model resulted from Chadwick's experimental work?
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Answer
The model that resulted from Chadwick's experimental work is A.
Step 4
What is meant by 'isotopes'?
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Answer
Isotopes are atoms of the same element that have the same number of protons (or the same atomic number) but different numbers of neutrons.
Step 5
Calculate the relative atomic mass (A) of potassium.
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Answer
To calculate the relative atomic mass of potassium (A), use the following formula:
A=100(39×93.1)+(41×6.9)
Calculating this gives:
A=1003639.9+282.9=1003922.8=39.2
Therefore, the relative atomic mass of potassium is 39.2 when rounded to one decimal place.
