Question

2 mark for review the complete photoelectron spectrum for an element is shown above. which of the following observations would provide evidence that the spectrum is consistent with the atomic model of the element? a a neutral atom of the element contains exactly two electrons. b the element does not react with other elements to form compounds. c in its compounds, the element tends to form ions with a charge of +1. d in its compounds, the element tends to form ions with a charge of +3.

Explanation:

The photoelectron spectrum shows two peaks of different binding - energies. A large binding - energy peak indicates inner - shell electrons and a smaller one indicates outer - shell electrons. Elements that tend to form + 1 ions have one valence electron. If an element forms + 1 ions, it has one electron in its outermost shell which is consistent with having two distinct electron energy levels as shown in the spectrum (inner and outer). Option A is wrong as the spectrum shows two different energy levels of electrons, not just two electrons in total. Option B is incorrect as we can't conclude non - reactivity from this spectrum alone. Option D is wrong because the spectrum doesn't suggest three valence electrons.

Answer:

C. In its compounds, the element tends to form ions with a charge of +1.