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Glite Dictionary
atomic number 5

atomic number 5

5.1
A chemical element called boron that appears as hard dark crystals or yellow-brown powder
  • noun
  • /əˈtɑːmɪk ˈnʌmbər faɪv/
  • Specialized
translation icon : número atómico 5
  • Boron, with an atomic number 5, is essential for plant growth.

Examples

  • The atomic number 5 corresponds to the element boron.

  • The periodic table lists boron under the heading atomic number 5.

  • Pure atomic number 5 is rarely found in nature but is widely used in industry.

  • Scientists refer to atomic number 5 when discussing the properties of boron.

  • Scientists refer to atomic number 5 when discussing the properties of boron.

  • The element atomic number 5 is commonly found in boron compounds.

  • Boron, which has an atomic number 5, is essential for plant growth.

Synonyms

B
vsatomic number 5
  • Specialized
8 4.9

A chemical element used in plant food and in some hard materials

names the element by a number rather than by a letter symbol
boron
vsatomic number 5
  • Specialized
7 6.2

A chemical element used to make strong glass and some industrial products

emphasizes the element's numeric identity and physical forms rather than its uses

Surface Forms

atomic number 5 singular
atomic numbers 5 plural

Morphology

atomic + number + five

The phrase is transparently compositional: 'atomic' (relating to atoms) + 'number' + 'five' yields 'the atomic number equal to five', i.e. the element whose atomic number is 5. This follows standard noun phrase composition and similar constructions across languages, so a B1 learner who knows the constituents can grasp the basic meaning (though knowing the element name 'boron' is domain-specific).

Etymology

Atomic number 5 comes from the way scientists list elements: atomic shows it is about atoms, number means a count, and 5 is the count of tiny particles called 'protons' in the atom. The element with five of these particles is 'boron', so Atomic number 5 means 'boron' today.