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Sagot :
You round to the nearest integer. You know that your compound contains 2.82 g of sodium, 4.35 g of chlorine, and 7.83 g of oxygen aluminum.
What is aluminum ?
The 13 electrons on an aluminum atom are grouped in the electron configuration [Ne] 3s2 3p1, which is three electrons more than the configuration of a stable noble gas. As a result, the fourth ionization energy alone is far lower than the sum of the first three ionization energies of aluminum. Such an electron configuration is envisaged for nihonium as well as the other well-characterized members of its group, including boron, gallium, indium, and thallium. In many chemical processes, aluminum may very simply give up its three outermost electrons (see below). Aluminum has an electronegativity of 1.61. (Pauling scale).
The radius of a free aluminum atom is 143 pm. The radius decreases to 39 pm for a 4-coordinated atom or 53.5 pm for a 6-coordinated atom when the three outermost electrons are eliminated.
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