2(a)
This question is about elements.
Identify an element that:
May/June 2026 Paper 43
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2(a)(i)Atmospheric Chemistry Air PollutionEasy1 mark
is approximately 21% of clean, dry air
2(a)(ii)Periodic Table TrendsEasy1 mark
is in Group 1 and Period 4 of the Periodic Table
2(a)(iii)Atomic Structure IsotopesEasy1 mark
contains atoms with exactly 24 protons
2(a)(iv)Water Chemistry Water TreatmentEasy1 mark
removes tastes and odours from the domestic water supply
2(a)(v)Giant Structures Metallic BondingEasy1 mark
exists as diamond
2(a)(vi)Preparing SaltsEasy1 mark
forms an insoluble chloride salt.
2(b)(i)Atomic Structure IsotopesEasy2 marks
Boron has two isotopes.
State the meaning of the term isotopes.
2(b)(ii)Atomic Structure IsotopesEasy1 mark
The isotopes of boron have mass numbers of 10 and 11.
The relative atomic mass of boron is 10.8.
Calculate the percentage abundance of the isotope of boron with a mass number of 10.
percentage abundance =