HYDROGEN ATOM

Pronunciation (US):

(GB):

IPA (US):

 Dictionary entry overview: What does hydrogen atom mean? 

• HYDROGEN ATOM (noun)
  The noun HYDROGEN ATOM has 1 sense:

1. an atom of hydrogen

  Familiarity information: HYDROGEN ATOM used as a noun is very rare.

 Dictionary entry details 

• HYDROGEN ATOM (noun)

Sense 1

Meaning:

An atom of hydrogen

Classified under:

Nouns denoting substances

Hypernyms ("hydrogen atom" is a kind of...):

atom ((physics and chemistry) the smallest component of an element having the chemical properties of the element)

Meronyms (parts of "hydrogen atom"):

hydrogen ion (a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus)

Hyponyms (each of the following is a kind of "hydrogen atom"):

acid hydrogen; acidic hydrogen (a hydrogen atom in an acid that forms a positive ion when the acid dissociates)

deuterium; heavy hydrogen (an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen))

 Context examples 

The hydroxyl group is incorporated into one fragment of the compound and the hydrogen atom in the other.

(Hydrolysis, NCI Thesaurus)

Amine having a univalent organic group (as phenyl) derived from an aromatic hydrocarbon by the removal of one hydrogen atom.

(Aromatic Amines, NCI Thesaurus)

The physical association between an electronegative atom and a hydrogen atom that is directly bound to a second, relatively electronegative atom.

(Hydrogen Bonding, NCI Thesaurus)

Aryl are radicals derived from an aromatic compound by removal of a hydrogen atom.

(Alkyltransferase and Aryltransferase, NCI Thesaurus)

Alcohol contains a carbon atom attached to a hydroxyl group (a molecule made of an oxygen atom and a hydrogen atom).

(Alcohol, NCI Dictionary)

Agents that replace hydrogen atom(s) in biologically active molecules with alky radical(s), hindering proper function.

(Alkylating agent, NCI Thesaurus)

An antineoplastic agent that replaces hydrogen atom(s) in nucleophilic moieties with alky radical(s), hindering proper function.

(Antineoplastic Alkylating Agent, NCI Thesaurus)

Alkylating Activity in biological systems is typically a process of covalent bonding in which a chemical substance replaces hydrogen atom(s) in biologically active molecules with alkyl radical(s), hindering proper function.

(Alkylation Process, NCI Thesaurus)

The hydroxyl (OH) radical, a molecule made up of one hydrogen atom, one oxygen atom with a free (or unpaired) electron is one of the most reactive gases in the atmosphere and regularly breaks down other gases, effectively ending their lifetimes.

(Greenhouse Gas ‘Detergent’ Recycles Itself in Atmosphere, NASA)

The new finding of widespread and relatively immobile water suggests that it may be present primarily as OH, a more reactive relative of H2O that is made of one oxygen atom and one hydrogen atom.

(On Second Thought, the Moon's Water May Be Widespread and Immobile, NASA)