Plumbane

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What Wikipedia says

Plumbane is an inorganic chemical compound with the chemical formula PbH4. Proposed to be a colorless gas at room temperature, it is a group 14 hydride composed of lead and hydrogen. Plumbane is not well characterized or, and it is predicted to be thermodynamically unstable, as is typical for heavy main group hydrides.

Excerpt from the Wikipedia article “Plumbane”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NEUROtiker, Public domain, via Wikimedia Commons.