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promethium
Promethium is a highly specialized term used almost exclusively within the fields of nuclear chemistry and physics. Because it is a synthetic element with no stable isotopes, it is rarely encountered in general conversation and is typically discussed in the context of radioactive decay or specialized industrial applications.
As a chemical element, it is treated as an uncountable noun. It refers to the substance as a whole rather than individual units, meaning it does not have a plural form in standard scientific usage.
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Ví dụ
Promethium is one of the few elements that does not occur naturally in significant quantities.
The professor explained that promethium is a member of the lanthanide series.
I wonder if promethium could be used to power a long term space probe.
Promethium isotopes are often used in nuclear batteries for remote sensors.
Wait, is promethium really that rare in the Earths crust?
The lab technician carefully handled the sample of promethium to avoid radiation exposure.
Promethium was named after the Titan Prometheus who stole fire from the gods.
The chemical properties of promethium are very similar to those of neodymium.