IB Chemistry HL S1.3 Electron configurations questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

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Multiple choice Written

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Question 1

Multiple choiceMedium1 mark

Three groups of lines in hydrogen’s emission spectrum converge at different photon energies. For the group whose lines converge at the highest photon energy, which energy level do the transitions end at, and what is the maximum number of electrons that level can hold?

Show answer and explanation

Answer: A. The highest-energy convergence limit corresponds to transitions ending at the lowest energy level, $n=1$ Its maximum capacity is $2n^2=2(1)^2=2$ electrons.
B: assigns the limit to $n=2$ then correctly applies $2n^2$
C: assigns the limit to $n=3$ then correctly applies $2n^2$
D: identifies $n=1$ but omits the factor of 2 in the capacity relation.
Remember: the maximum number of electrons in level $n$ is $2n^2$

Question 2

Paper 2Medium7 marks

The wavelength corresponding to the limit of convergence at higher frequency in the emission spectrum of gaseous element Q is $285.7\ \mathrm{nm}$

A database gives the following successive ionization energies for Q.

Ionization energy	Value / $\mathrm{kJ\,mol^{-1}}$
First	419
Second	3052
Third	4420
Fourth	5877

(a)

Calculate the first ionization energy of Q in $\mathrm{kJ\,mol^{-1}}$ using the data booklet. Give your answer to three significant figures.

[3]

(b)

Use your result from (a) and the successive ionization energy data.

(i)

State whether your result from (a) agrees with the database value for the first ionization energy to three significant figures.

[1]

(ii)

Deduce the group of Q, explaining your deduction using the successive ionization energy data.

[3]

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