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 noble gases (Group 0) had not been discovered at the time Mendeleev published his periodic table.
Step 2
Which model represents the plum pudding model? Tick (✓) one box.
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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? Tick (✓) one box.
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Answer
The model resulting from Chadwick’s experimental work is A.
Step 4
What is meant by 'isotopes'?
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Isotopes are atoms of the same element that have the same number of protons (same atomic number) but differ in the number of neutrons.
Step 5
Calculate the relative atomic mass (A) of potassium.
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Answer
To calculate the relative atomic mass (A) of potassium, use the formula:
A=100(39×93.1)+(41×6.9)
Calculating this gives:
A=100(3639.9+282.9)=39.138
Rounded to 1 decimal place, the relative atomic mass of potassium is 39.1.
