Italic digits

Note The first insignificant digit should be carried through intermediate calculations. This digit is shown using italics in the solutions below. 

Note The numb are rounded to the first digit after decimal point, except when indicated by, where the numbers are rounded to second digit after the decimal point Most abundant tree nut source for each vitamin is indicated in bold italic, while the most abundant vitamin in a single tree nut is given in bold nd, not detected. 

In the following, we shall denote the number of electron pairs in the valence shell of the central atom by a digit in italics behind the formula. The mercury dihalides HgX2 (2) (X=C1, Br or I) and the Hg-Hg-bonded dimeric monohalides Hg2X2 (2) all have two bonding electrons pairs (and no nrmbonding electrons) in the valence shell of the merciuy atoms and all adopt linear structures. The structure of the ion [T1(CH3)2]" (2) is also linear. 

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