![]() Aluminum is a post-transition metal in group 13, period. Aluminum is a chemical element with symbol Al and atomic number 13. Aluminum is only about one third as dense as iron. ![]() As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear charge Z eff (as discussed) and are drawn. The stability of an elements outer (valence) electrons determines its chemical and physical properties. The recycling of aluminum scrap metal saves over 90 of the energy required to separate aluminum from bauxite. Any help understanding this would be greatly appreciated. For example, the covalent radius of an aluminum atom (1s 2 2s 2 2p 6 3s 2 3p 1) is 118 pm, whereas the ionic radius of an Al 3+ (1s 2 2s 2 2p 6) is 68 pm. I also tried multiplying the unit cell mass by $4$ which gave me a final answer of $1.87$. Expert Answer 100 (8 ratings) We know that from the left to right of a period, the atomic radius of the elements decreases, and in a group ( from the top to the bottom of the group), it increases. Aluminum has a density of $\pu$ is a face-centered cubic unit cell and has 4 particles per unit cell I tried multiplying my final answer by $4$, but that gives me $4.72$. ![]() Solid aluminum forms a face-centered cubic unit cell. Find step-by-step Chemistry solutions and your answer to the following textbook question: Aluminum has an atomic radius of 143 pm and forms a solid with a. I'm having trouble understanding why I can't get the correct answer from this homework problem:
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