XPS analysis of this element must be careful not to confuse it with a similar binding energy peak from zinc. Sodium, oxygen, and this element make up Graham’s salt. The Gutmann–Beckett method uses NMR spectroscopy of this element’s 31 isotope. (10[5]-5[1])A (10[1])triphenyl (10[2]-5[1])derivative (10[3]-5[1])of this (10[1])element (10[5])is found (10[1])in Vaska’s (-5[1])complex (10[3])and can also (-5[1])be used (10[2])to create ylides (10[4])(“ILL-ids”) in the (10[2])Wittig (10[5])reaction. (10[12])Oxygen (10[2])and (10[1])this element can (10[1])form anions (10[2])designated (10[1])as (10[1])ortho or pyro, (10[2]-5[2])and also (10[2])forms a (10[1])triprotic (-5[2])acid. (10[1]-5[1])Alongside nitrogen (-5[3])and potassium, (10[1])fertilizers report (10[2])the content (10[4]-5[1])of (10[1])this (10[3]-5[1])element. (10[5]-5[2])For (10[1])10 points, (10[2]-5[1])name (-5[1])this (10[1])element with red (-5[1])and white (10[1])varieties (10[9])used (10[1])to light (10[4])matches. (10[4])■END■ (10[11]0[1])