May/June 2026 Paper 41

2026 · 7 questions · 47 parts · 80 marks

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2(a)

This question is about elements.

Identify the element that:

2(a)(i)Properties Metals AlloysEasy1 mark

is used in the manufacture of overhead electrical cables because of its low density

2(a)(ii)Periodic Table TrendsEasy1 mark

is in Group VII and Period 4 of the Periodic Table

2(a)(iii)Atomic Structure IsotopesEasy1 mark

contains atoms with exactly 23 protons

2(a)(iv)Water Chemistry Water TreatmentEasy1 mark

kills microbes in the domestic water supply

2(a)(v)Atmospheric Chemistry Air PollutionEasy1 mark

is approximately 78% of clean, dry air

2(a)(vi)Metal ExtractionEasy1 mark

has an acidic oxide which forms slag in the blast furnace.

2(b)(i)Atomic Structure IsotopesEasy2 marks

Isotopes are different atoms of the same element. Explain, in terms of protons and neutrons, the similarity and difference between isotopes of the same element.

Answer

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2(b)(ii)Atomic Structure IsotopesEasy2 marks

A sample of magnesium contains three isotopes. Table 2.1 shows the percentage abundances and the relative masses of the three isotopes of magnesium in this sample.

Table 2.1

percentage abundance	relative mass
80	24
10	25
10	26

Calculate the relative atomic mass of magnesium to one decimal place.

relative atomic mass =

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