For each of the negative ions listed in column 1, use the periodic table to find in column 2 the total number of electrons the ion contains. A given answer may be used more than once. Column 1] Se2_ [a] 18 [ 2] S2_ [b] 35 [ 3] P3_ [c] 52 [ 4] O2_ [d] 34 [ 5] N3_ [e] 36 [ 6] I_ [f] 54 [ 7] F_ [g] 10 [ 8] Cl_ [h] 9 [ 9] Br_ [i] 53  At_ [j] 86
Enzymes 2) They act as “catalysts” – which speeds up or allows a chemical reaction to occur, without being changed itself. 3) Enzymes are very specific for the compounds they work with. 4) Enzymes can often be identified in the written form because they may contain the suffix –ase. Nucleic Acids – contain C, H, O, N, P a. The building blocks for nucleic acids are nucleotides. Each nucleotide has a sugar, a N base, and a P-containing section.