Chemistry 9701 · AS & A Level · The Periodic Table: chemical periodicity

The Periodic Table: chemical periodicity — practice question

The Periodic Table used at present comes directly from Mendeleev’s 1869 proposal, after he observed repeating patterns in the physical and chemical properties of the elements he had examined. The diagram below displays the first ionisation energies of the first 18 elements of the Periodic Table.
(a)[2]

State the equation, including state symbols, for the first ionisation energy of sulfur.

(b)[3]

Explain why there is a general increase in first ionisation energies across the Period from sodium to argon.

(c(i))

Explain why the first ionisation energy of magnesium is greater than that of aluminium.

(c(ii))[4]

Explain why the first ionisation energy of phosphorus is greater than that of sulfur.

(d(i))

Complete the ‘conductivity’ row using only the words ‘high’, ‘moderate’ or ‘low’.

(d(ii))[5]

Complete the ‘melting point’ row using only the words ‘high’ or ‘low’.

(e)[1]

Using the properties of the third Period elements aluminium to chlorine, suggest the identity of the fourth Period element E.

Worked solution & mark scheme

This 15-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct equation $\mathrm{S(g) \rightarrow S^+(g) + e^-}$” …

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