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Glite Dictionary
atomic number 91

atomic number 91

9.6
A radioactive metal element called protactinium often made when uranium breaks down
  • noun
  • Specialized
translation icon : número atómico 91
  • The element with atomic number 91 is protactinium.

Examples

  • The element with atomic number 91 is known as protactinium, a radioactive metal.

  • Uranium decay can eventually produce atomic number 91 as one of its byproducts.

  • Due to its radioactivity, atomic number 91 must be handled with extreme care in laboratories.

  • The scientist detected traces of atomic number 91 in the mineral sample.

  • Many scientists study atomic number 91 for its unique properties.

  • In nuclear chemistry, atomic number 91 is significant due to its role in radioactive decay.

  • Researchers are investigating the applications of atomic number 91 in various fields of science.

Synonyms

Pa
vsatomic number 91
  • Specialized
1 9.9

A rare radioactive metal that comes from uranium and slowly turns into lead

is a numeric label rather than a written or symbolic name
protactinium
vsatomic number 91
  • Specialized
1 9.9

A rare short-lived radioactive metal found in uranium ores that slowly turns into lead

is a numeric label that identifies the same element
protoactinium
vsatomic number 91
  • Specialized
9.9

A short-lived radioactive metal that forms from uranium and turns into actinium and lead

is a numeric identifier rather than a written name

How Radioactive

atomic number 91
  • Specialized
9.6
uranium
  • Specialized
115 7.3

Surface Forms

atomic number 91 singular
atomic numbers 91 plural

Morphology

atomic + number + ninety-one

The phrase is fully compositional: 'atomic' (pertaining to atoms) + 'number' (a numerical identifier) + 'ninety-one' yields 'the atomic number equal to 91', which directly denotes the element with that atomic number. This is a literal, technical description rather than an idiom, so a B1 learner who knows the constituent words can reasonably infer it refers to the element with atomic number 91 (even if they may not know the name 'protactinium').

Etymology

Atomic number 91 names the chemical element protactinium. The phrase atomic number tells how many 'protons' are in an atom, so 91 means 91 protons, which is why this label points to that particular, short-lived 'radioactive' element.