Which of the following elements is likely form a substitutional solid solution w

Question

Which of the following elements is likely form a substitutional solid solution with the highest amount of substitution (i.e. highest solubility) in Al which has a FCC lattice?

Be                                          

Ca                                          

Mn                                        

Ba                                          

Cs                                          

Ag                                          

Na                                         

Pb

Explanation / Answer

Be and Na have a smaller size as compared to Al atoms so they have the highest solubility in Al FCC lattice.

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