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Pm British & World English

The chemical element promethium

p.m. British & World English

After noon, used after times of day between noon and midnight not expressed using the 24-hour clock

promethium British & World English

The chemical element of atomic number 61, a radioactive metal of the lanthanide series. It was first produced artificially in a nuclear reactor and occurs in nature in traces as a product of uranium fission

Pm in promethium British & World English

The chemical element of atomic number 61, a radioactive metal of the lanthanide series. It was first produced artificially in a nuclear reactor and occurs in nature in traces as a product of uranium fission