Chemistry 5070 · O Level · Atomic structure and the Periodic Table

Atomic structure and the Periodic Table — practice question

Select from the particles listed to answer the questions. Particles available: CH$_4$, Cl$^-$, Fe$^{2+}$, H$^+$, H$_2$S, MnO$_4^-$, NH$_4^+$, P$^{3-}$. Any particle may be used once, more than once, or not at all.
(a)[1]

Which particle contains exactly eighteen protons?

(b)[1]

Which particle is employed to test for a reducing agent?

(c)[1]

Which particle is an ion containing only ten electrons?

Worked solution & mark scheme

This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: H₂S

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