Question

species of hydrogen ​

Answer 1

In view of the widespread use in biochemistry of labelling with hydrogen isotopes, recent IUPAC recommendations [2] for unambiguous naming of these isotopes may interest biochernists. There is often little harm in current practice of using the name 'proton' both for 1H+ and for H+ in its natural abundance of isotopes, but there are contexts in discussing isotope effects where distinction is necessary. The names listed in Table 1 allow the ambiguities to be avoided. Thus the general terms allow description of experiments on reaction mechanism, e.g. where hydronation is specifically with 2H+ or with 3H+, where the term 'protonation' would be misleading. The use of the recommendations may be illustrated by the following example: 'The observation of a protium/deuterium kinetic isotope effect may be interpreted in terms of the extent of hydron transfer in the transition state'.

Table 1. Names for hydrogen species

General 1H 2H 3H

Atom (H) hydrogen protium deuterium tritium

Cation (H+) hydron proton deuteron triton

Anion (H-) hydride protide deuteride tritide

Group (-H) hydro protio deuterio tritio

Transfer of cation to substrate hydronation protonation deuteronation tritonation

Replacement of hydrogen by a specific isotope protiation deuteriation

(or deuteration) tritiation

Answer 2

Answer:

Protium (atmic no1)

Deutrium(2)

Tritium(3)

Explanation: