Vanadium may have been used by some ancient animals ____________.

How many unpaired electrons does the manganese ion have in [Mn(CN) 6] 4–?     2 unpaired electrons     5 unpaired electrons     1 unpaired electron     3 unpaired electrons     No unpaired electrons

Indicate the (i) metal oxidation state, (ii) d-electron count, and (iii) the coordination number of the following anticancer agent. H₂C. H₂C HOOC ₂CH₂ 0, 6, 4 0, 8, 4 +2, 6, 4 +2, 8, 4 +2, 8, 6 CH₂ -CH₂ COOH

What is the process of making chlorine from the electrolysis of sodium chloride called? chlor-alkali process electrolysis reduction oxidation   Which of the following ligands has the weakest field strength? Br- C2O42- NH3 NO2-   What common acid will react with silicon dioxide? hydrofluoric acid hydrochloric acid sulfuric acid nitric acid   What holds the layers of graphite together? London dispersion forces Hydrogen bonds dipole-dipole forces Ionic bonds   Which of the following noble gases can form stable compounds? Xenon Krypton Argon Helium   Why are group 12 elements considered representative metals? The last electron is an s electron They do not have d electrons The d electrons move to the s shell none of these