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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 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.

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Then does it mean that if we add one elctron to the proton then it will start behaving like hydrogen atom.. – newera Apr 29 '13 at 18:30
If the electron-proton system gives off energy and enters a bound state, then yes, it will behave like a hydrogen atom. – G. Paily Apr 29 '13 at 18:32
Then it will clearly mean that alchemistry was possible.. We can simply convert one element to other by taking protons away or adding some protons..Doesn't it sound weird?? – newera Apr 29 '13 at 18:41
Yes, you can convert an atom of one element into an atom of another by adding the appropriate number of protons and neutrons to the nucleus. For example, you could start with a hydrogen nucleus (A=1, Z=1) and add two protons and four neutrons to make a lithium nucleus (A=7, Z=3). But this is extremely hard!! Protons are positively charged, and so two protons repel each other. To introduce another proton into the nucleus is very hard and requires a lot of energy to overcome the repulsion. Thus it is not easy to convert one element into another. – G. Paily Apr 29 '13 at 18:50
To continue: Yes, it can be done, typically in a particle accelerator. This is how most of the elements with atomic charge numbers Z>100 were produced. See this link (…) for more details. – G. Paily Apr 29 '13 at 18:52

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