atomic number 75

8.2

A rare heavy metal called rhenium used in alloys that resist heat

noun
/əˈtɑːmɪk ˈnʌmbər 75/

Specialized

: número atómico 75

Rhenium has an atomic number 75 and is quite rare.

Examples

The atomic number 75 represents the element rhenium.
The alloy contains a trace amount of atomic number 75 to improve its resistance to heat.
Because of its high melting point, atomic number 75 is valuable for use in jet engine components.
Scientists discovered a new method for isolating atomic number 75 during molybdenum refining.
Because of its high melting point, atomic number 75 is valuable for use in jet engine components.
The alloy contains a trace amount of atomic number 75 to improve its resistance to heat.
Scientists discovered a new method for isolating atomic number 75 during molybdenum refining.

Synonyms

vsatomic number 75

Specialized

2 9.9

A rare heavy metal that people use to make heat-resistant alloys

is the standard name focusing on general alloy use and by-product source

rhenium

vsatomic number 75

Specialized

1 9.9

A rare heavy silvery-white metal used in metal mixes for very hot parts like jet engines

is broader and mentions use in some alloys and by-product origin

Surface Forms

atomic number 75 singular

atomic numbers 75 plural

Morphology

atomic + number + seventy-five

The phrase is a straightforward composition: 'atomic' (relating to atoms) + 'number' + 'seventy-five' indicates the element with atomic number 75. This scientific naming pattern is regular and cross-linguistically common, so a B1 learner who knows the parts will understand it refers to the element with atomic number 75 (even if they do not know the name 'rhenium').

Etymology

Atomic number 75 names the element whose atoms have 75 'protons' inside; that element is rhenium, a rare, heavy, silvery metal used in jet engines and heat-resistant alloys, so the phrase today refers to that metal.