AP Chemistry Question of the Day --24

Welcome back to my blog. Here comes the answer to question 23 I posted yesterday. The correct answer is C. 


Metallic solids are often pure substances, but may also be mixtures called alloys. Some properties of alloys can be understood in terms of the size of the component atoms:
— Interstitial alloys form between atoms of different radius, where the smaller atoms fill the interstitial spaces between the larger atoms. The interstitial atoms make the lattice more rigid, decreasing malleability and ductility, increasing hardness as seen in this question. This is the case of Au and Cu alloy.
— Substitutional alloys form between atoms of comparable radius, where one atom substitutes for the other in the lattice. The density typically lies between those of the component metals, and the alloy
remains malleable and ductile. This is the case for Ag and Au alloy.

 Following is Question 24 of the series. 

24. The photoelectron spectra above show the energy required to remove a 1s electron from a nitrogen atom and from an oxygen atom. Which of the following statements best accounts for the peak in the upper spectrum being to the right of the peak in the lower spectrum?

(A) Nitrogen atoms have a half-filled p subshell.
(B) There are more electron-electron repulsions in oxygen atoms than in
nitrogen atoms.
(C) Electrons in the p subshell of oxygen atoms provide more shielding than
electrons in the p subshell of nitrogen atoms.
(D) Nitrogen atoms have a smaller nuclear charge than oxygen atoms.

I will post the answer and explanation tomorrow. 

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