Water- or acid-soluble compounds with this element are highly toxic, because this element can block potassium channels in the membranes of neurons. It is considered to be a heavy metal, but not a transition metal. The relatively heavy nuclei of this 
Water- or acid-soluble compounds with this element are highly toxic, because this element can block potassium channels in the membranes of neurons. It is considered to be a heavy metal, but not a transition metal. The relatively heavy nuclei of this element helps make its low solubility sulfate an excellent X-ray absorber that can be administered to serve as a radio contrast in the gastrointestinal tract. Like copper, it gives a green flame test. Identify this element with a name from the Greek for "heavy", and with atomic number 56, symbolized Ba.
Water- or acid-soluble compounds with this element are highly toxic, because this element can block potassium channels in the membranes of neurons.
{barium} [accept {Ba} before the end]