Difference between atom and elementary particle questioned

Hydrogen ion doesn't have one electron which clearly mean that it has only one proton..So hydrogen ion is only a proton. Am I right, please make it clear. If hydrogen ion and proton are same that how to explain the reactivity with electron?

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it is not clear why you have a problem. Ion means an atom minus at least one electron , the hydrogen atom has only one electron and a single proton as a nucleus. Deuterium also has one electron and the bare charge 1 nucleus is composed of a proton and a neutron. It is the positive charge of the proton that attracts the negative electron. – anna v Apr 29 '13 at 18:07
Then does it mean that hydrogen ion and proton is one and same thing? What is the fundamental difference between them? – newera Apr 29 '13 at 18:10
If you're talking about hydrogen and not any of it's isotopes (deutirium, tritium) then there is no difference between a Hydrogen ion and a proton. They are the same thing. – Kitchi Apr 29 '13 at 18:22
Isn't there diff...like energy between them, one possessing more energy and other not.. – newera Apr 29 '13 at 18:31
the hydrogen positive ion and the proton are identically the same – anna v Apr 29 '13 at 18:38

A hydrogen atom ion $H^{+}$, with an atomic mass number of A=1, charge number Z=1, is the same as a proton. A hydrogen ion thus usually just refers to a proton. Depending on context, however, you may also have a hydrogen ion which is (a) an ion of a deuterium atom, in which case it is a bound state of a neutron and a proton, with atomic mass number A=2, charge number Z=1; or you could have (b) a hydrogen molecule ion, which is $H_{2}^{+}$, which is a hydrogen molecule with one electron stripped off.