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The Nuclear Atom · Paper 2 — Free Chemistry HL Practice Questions

1MasterySAQ-SAtomic number, mass number, isotopes5 marksPaper 2~8 min
An element X exists as three naturally occurring isotopes. The mass spectrum of X shows three peaks: Peak — Mass number — Relative abundance 1 — 24 — 79.0%79.0\% 25 — 10.0%10.0\% 3 — 26 — 11.0%11.0\%
(a)
State the relationship between mass number, atomic number, and number of neutrons. [1 mark]
(b)
Calculate the relative atomic mass of element X. [2 marks]
(c)
The element X has atomic number 12. Deduce, with reference to its electron configuration, why X forms an ion with a charge of 2+2+. [2 marks]
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Solutions

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