AP Chemistry 1.5.A: Electron Configuration

Explore AP Chemistry 1.5.A questions on ground-state electron configurations, core and valence electrons, Aufbau filling, ion formation, and ionization energy.

[Maximum number: 2]

Answer the following questions related to manganese compounds.

(a)

Manganese has several common oxidation states.

[ 2 ]

(i) For the correct answer: 1 point
Accept one of the following:

- $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{5}$

- $[\mathrm{Ar}] 4 s^{2} 3 d^{5}$

(i)

Write the complete electron configuration for an Mn atom in the ground state.

[ 1 ]

(i) For the correct answer: 1 point
Accept one of the following:

- $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{5}$

- $[\mathrm{Ar}] 4 s^{2} 3 d^{5}$

(ii)

When manganese forms cations, electrons are lost from which subshell first? Identify both the number and letter associated with the subshell.

A student performs an experiment to produce a manganese salt of unknown composition, $\mathrm{Mn}_{x} \mathrm{Cl}_{y}(a q)$ , and determine its empirical formula. The student places a sample of Mn(s) in a beaker containing excess HCl(a q), as represented by the following equation.

x \mathrm{Mn}(s)+y \mathrm{HCl}(a q) \rightarrow \mathrm{Mn}_{x} \mathrm{Cl}_{y}(a q)+\frac{y}{2} \mathrm{H}_{2}(g)

The student heats the resulting mixture until only $\mathrm{Mn}_{x} \mathrm{Cl}_{y}(s)$ remains in the beaker. The data are given in the following table.

[ 1 ]

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1.5.A—Represent the ground-state electron configuration of an atom of an element or its ions using the Aufbau… question 1

Question (a)

Question (i)

Question (ii)