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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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Answer

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: $A = \frac{(39 \times 93.1) + (41 \times 6.9)}{100}$

Calculating this gives: $A = \frac{(3639.9 + 282.9)}{100} = 39.138$

Rounded to 1 decimal place, the relative atomic mass of potassium is 39.1.

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