noun

ununennium

oo-noo-NEN-ee-uhm

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Ununennium (noun) means the systematic placeholder name for the chemical element with atomic number 119, which has not yet been discovered. Example: “Ununennium sits below francium on the periodic table's extended rows.”

noun

chemistry The systematic placeholder name for the chemical element with atomic number 119, which has not yet been discovered.

"Ununennium sits below francium on the periodic table's extended rows."

"Scientists refer to element 119 as ununennium until it is confirmed and officially named."

"No sample of ununennium has ever been produced or observed."

How to use ununennium

Learner’s notes

In plain EnglishUnunennium is the placeholder name scientists use for element 119, which hasn't been found yet.

When to use it

Ununennium is a technical term used only in chemistry and physics contexts.

Memory tip

Break it into its number parts to remember it: un-un-enn-ium means one-one-nine.

Trace the full origin ↓

Common pairings

element 119 the discovery of ununennium synthesise ununennium atomic number 119

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C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

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Can you complete this real example?

_____ sits below francium on the periodic table's extended rows.

Etymology

Ununennium is a systematic element name built from Latin- and Greek-derived numeral roots (un-, un-, enn-) meaning one, one and nine, combined with the standard -ium ending used for element names.

Origin: New Latin

Synonyms

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eka-francium

Rhymes for ununennium

curium osmium cerium erbium sodium helium barium cadmium caesium fermium gallium niobium

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Frequently asked questions

What is ununennium?

Ununennium is the systematic name for the undiscovered chemical element with atomic number 119.

Has ununennium been discovered?

No, as of now ununennium has not been discovered — it remains a theoretical, as-yet-undiscovered element.

Why is ununennium called that?

Its name is built systematically from roots meaning one, one and nine, reflecting its atomic number 119.

What is the meaning of ununennium?

"ununennium" (noun) means the systematic placeholder name for the chemical element with atomic number 119, which has not yet been discovered.