I am not specilest but it sure not a metal, it is just an essential gas and ocupy the first element in the periodic table followed by Helliom, very important for life....

I hope to be right!

Emad

Thanks Dr. Emad, good answer

Non metal

Link may helpful

https://chem.libretexts.org/Core/Inorganic_Chemistry/Descriptive_Chemistry/Elements_Organized_by_Block/1_s-Block_Elements/Group__1%3A_The_Alkali_Metals/Z%3D001_Chemistry_of_Hydrogen_(Z%3D1)

Thank you dear Gopikrishna for response.

I read that hydrogen is a metal hydrides. Find attached. Kind regards

Thank you Dr. Dickson Adam for informative answer.

Hydrogen is a chemical element with the symbol H and atomic number 1. With just one proton and one electron, it is the most common element, making up 75% of the mass of the entire universe.

Thank you Dr Mahesh for response.

Hydrogen is lightest element on periodic table. Hydrogen is colourless, Odourless gas.

Hydrogen is a non metal but shares a group with metals because of its attribute to form cation.

Hydrogen is not considered a metal, even though it does exist in Group I (alkali metals) of the periodic table. Metallic hydrogen has been predicted at extremely high pressure (e.g., interior of Jupiter), under which compressed hydrogen atoms lose their electrons to delocalization ("sea of electrons"). There have even been scientific reports regarding production of metallic hydrogen. Wikipedia provides a good review of metallic hydrogen and includes those instances in which metallic hydrogen has been reported: http://en.wikipedia.org/wiki/Met...

Hydrogen is a gas

Dear powerful and respected Khluood,

Hydrogen is classified as non-metal. This is because it behaves as non- metal.

Best regards,

Kifilideen.

Dear respected and powerful Khulood,

Hydrogen is positioned in group one (alkali metal group) so as to have the best arrangement of the elements in the periodic table. Although it behaviour is that of a non-metal. One electron in it outermost shell support it position in group one.

Best regards,

Kifilideen.

Hydrogen requires a very high ionization energy to remove the only one electron in it outermost shell. The high ionization energy is due to the closeness of the electron in the outermost shell of the hydrogen and the nuclear charge of the hydrogen atom. In nature, they share electron with another neighboring hydrogen to form hydrogen gas instead of transferring electron to form ions. Gas formation occurs among non metals for examples SO2, N2, F2, Cl2, and so on. Basically metals do not exist in gaseous form either when forming bond with atom of it kind or atom of another element. In case of hydrogen which is found in group one there is negation to the way it behaves and the way other metals behave. Hydrogen reacts with some elements to form gas for examples H2S, H2O, HF, HI, NH3 and so on. For this reason hydrogen can not be classified as metal but rather non-metal. In conclusion hydrogen is a non- metal.

Best regards,

Kifilideen.

Thank you all my friends colleagues for your good and interesting answers, Dr. Ashok Pundir, Segun Michael, Hind S. Abdulhay, Nafees Mohammad, Kifilideen Lekan.good luck

Thanks Dr. Paul Olusegun for your answer.

Good luck

Though hydrogen often placed at the top of the alkali metal column in the periodic table, hydrogen does not, under ordinary conditions, exhibit the properties of an alkali metal. Instead, it forms diatomic H2 molecules, analogous to halogens and non-metals in the second row of the periodic table, such as nitrogen and oxygen. Diatomic hydrogen is a gas that, at atmospheric pressure, liquefies and solidifies only at a very low temperature (20 degrees and 14 degrees above absolute zero, respectively).

Over 70 years ago Wigner and Huntington predicted that if solid molecular hydrogen was compressed to a pressure of 25 GPa it would have a dissociative transition from a molecular solid to an atomic solid with a half-filled conduction band so that it would be metallic. Later, Ashcroft predicted that the putative metallic hydrogen might be a room temperature superconductor. It was also predicted by Ramaker, Kumar, and Harris that high pressure molecular hydrogen would become metallic; a recent publication predicts high temperature superconductivity for the molecular phase. Brovman, Kagan, and Kholas showed that hydrogen would be a metastable metal with a potential barrier of ~1 eV. That is, if the pressure on metallic hydrogen were relaxed, it would remain in the metallic phase, just as diamond is a metastable phase of carbon. Silvera and John stated that Since metallic hydrogen is yet to be produced in the laboratory, none of these ideas have been tested. (Silvera, Isaac F. and John W. Cole. 2010. Metallic hydrogen: The most powerful rocket fuel yet to exist. https://dash.harvard.edu/bitstream/handle/1/9569212/Silvera_Metallic.pdf?sequence=2 )

In 2011 Eremets and Troyan reported observing the liquid metallic state of hydrogen and deuterium at static pressures of (260–300 GPa). In 2015, scientists at the Z Pulsed Power Facility announced the creation of metallic deuterium. On October 5, 2016, Ranga Dias and Isaac F. Silvera of Harvard University released claims of experimental evidence that solid metallic hydrogen had been synthesised in the laboratory. In the preprint version of the paper, Dias and Silvera write: With increasing pressure we observe changes in the sample, going from transparent, to black, to a reflective metal, the latter studied at a pressure of 495 GPa. Prominent members of the high-pressure research community have criticised the claimed results, questioning the claimed pressures or the presence of metallic hydrogen at the pressures claimed.

Good and informative explanation Dr. Dhiaa Neama.

Thanks so much

Dear Dr Dhiaa,

Could it be that dissociated interfacial water in which free protons and hydronium ions are present, could be form of superconducting material at room temperature? My question come froma fundamental point in the structure and energetics of biological membranes and their reductionist counterparts, the lipid bilayers. Dissociated water is just imprescindible in their structure.

Dear Dr. Vera Maura,

You mean if could water dissociation occurs in biological members, that's can not be, bilayer membrane contain outer lipid layer and inner aquous layer, the latest one can not be as dissociated water but as H2O and hydrogen, then water can not be dissociated unless affected by certain factor such electrical current and other.

I hope if I could be understood you.

Dear Dr. Khulood Obaid , you come up very interesting and comic question.

Sources:

https://www.patana.ac.th/parents/curriculum/chemistry/units/LR503.html

http://www.ckrs.org/ckrs/About%20CKRS/Faculty%20Email%20and%20Web%20Pages/Mrs.%20Gail%20Grisi/GRADE%208%20PHYSICAL%20SCIENCE-Lessons%2CStudy%20Guides/%28Leopards%29%20Reading%20essentials%20c.11-3%20Nonmetals%20and%20Metalloids.pdf

https://chemistry.tutorvista.com/inorganic-chemistry/metals-non-metals-metalloids.html

I think you asking about hydrogen H2 not about the natural element H. for H2 it's a kind of gases has some propriety and it's used as fuel. it's used the energy production. as application it's used for the fuel cell. this application is in progression. It my obtained by extraction or electrolysis. the main problem of the using of hydrogen is it's storage because it's a combustible.

kind regards

Thanks dear Dr. Ali Benhmidene for response, good explanation.

I agree with Dr. Dhiaa Neama Jabbar .

Dear, Dr. Vera Maura Fernandes de Lima

Many thanks for your kind comment

1- Ashcroft predicted that the putative metallic hydrogen might be a room temperature superconductor (Ashcroft NW. Metallic Hydrogen: A High Temperature superconductor? Phys Rev Lett. 1968;21(26):1748-9.)

2- Although I am not specialist in biology, i guess the following reference may be useful regarding the mater you pointed out.

(Emilio Del Giudice, Vladimir Voeikov, Alberto Tedeschi and Giuseppe Vitiello " The origin and the special role of coherent water in living systems" Chapter 5, D. Fels, M. Cifra and F. Scholkmann (Editors), Fields of the Cell, 2015, ISBN: 978-81-308-0544-3, p. 95–111. (https://www.researchgate.net/publication/278966130_The_origin_and_the_special_role_of_coherent_water_in_living_systems)

Best regards

The following links are useful:

https://en.wikipedia.org/wiki/Properties_of_metals,_metalloids_and_nonmetals

http://www.dummies.com/education/science/chemistry/the-periodic-table-metals-nonmetals-and-metalloids/

https://answers.yahoo.com/question/index?qid=20080308145009AA0eyx8&guccounter=1

https://www.quora.com/Is-hydrogen-a-metal-a-metalloid-or-a-non-metal-Why

Regards

Thanks Dr. Asit Kumar, for informative links.

Very useful information.

Thank you good help, i have read the paper by Emilio Giudicce et als, great paper indeed.

Hydrogen is a chemical element with the symbol H and atomic number 1. Hydrogen is located in the periodic table within the elements of the first cycle and above the elements of the first group. In the standard conditions of pressure and heat, hydrogen is a colorless and odorless gas, flammable, nontoxic, monocrystalline dichromate has a molecular formula H2.

Hydrogen has three isotopes are available naturally, a ¹H and ²H and ³H

Some uses of hydrogen gas: Enter into a large number of chemical and oil industries, such as ammonia industry, fossil fuel manufacturing processes, and hydrogenation processes. Hydrogen is a reducing agent for mineral elements from their ores. It is used in many physical and engineering applications; it is used as a condensate during the welding process and is used in deep cooling, such as turbine generator cooling, due to its low viscosity. Hydrogen gas is used with nitrogen gas to detect the precise leakage in power plants and in multiple industries. Hydrogen can be used as an alternative to energy.

To discover

Hydrogen was first identified as a distinct substance from other flammable gases in 1766 by Henry Cavendish, for whom he was credited

Hydrogen gas is the lightest gas

Thanks a lot all my colleagues

Two American scientists have succeeded in compressing the hydrogen so heavily that it has turned it into a metal that is a completely new material that may be used as a superconductor for electrical energy at room temperature.

Thanks dear Djaafar Zemali for your valuable response.

Regards

Discovery of hydrogen

Chemical symbol: H

Atomic number: 1

Mass number: 1.008

Status: Gas

Color: Colorless

Element Category: nonmetal

Electronic Distribution: 1

Melting Point: 259.2 -

Boiling point: 252.87 -

Name of the finder: Henry Cavendish

Discovery place: London (UK)

Year of Discovery: 1766.

Origin of the label: from the Greek word "Lithos" means stone .. Hydrogen

In my opinion, the most important is the distance between H and how many atoms in the system. If it is periodic, and the distance is appropriate，H system can behave like a metal.

In brief explanation, Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkalimetals. ... However, hydrogen is very different from the halogens.

It is difficult to decide where hydrogen belongs in the periodic table because of the physical properties of the element. ... This three dimensional graph of the electronegativities of the main-group elements helps us understand why it is difficult to classify hydrogen as a metal or a nonmetal.

While hydrogen is typically a gas on Earth, it can be artificially compressed and cooled to become a liquid or a solid. Even in these states, hydrogen remains a non-metal — its atoms hold on to their electrons tightly, so hydrogen conducts heat and electricity poorly.

Scientists have already made liquid metal hydrogen—the substance thought to form the interior of giant planets like Jupiter—by ramping up pressure at higher temperatures. ... As the pressure rises, the liquid quickly becomes a nonmetallic solid.

Hydrogen is a nonmetal since it lacks any of the physical properties of a metal.

The purported existence of metallic hydrogen at close to 500 GPa is basically irrelevant since the following nonmetals would also become metals at that kind of pressure: B, Si, Ge; P; O, Se, Te; Cl, Br and I.

While in some respects hydrogen appears to behave like a metal (with its tendency to, at first, lose its one valence electron), most of its chemistry can be explained in terms of its tendency to, "acquire the electronic configuration of the noble gas helium [behaving in this way as a nonmetal]; this it can do by gaining an additional electron to give the hydride ion, H-, by sharing its electron and accepting a part share of an electron from another atom as in the hydrogen molecule H-H, and by accepting a lone pair of electrons, which it does as a proton when it combines with, for example, water and ammonia to give the hydroxonium, H3O+, and ammonium, NH4+, ions respectively."

--- Liptrot GF 1983, Modern Inorganic Chemistry, Collins Educational, London, p. 161

I think hydrogen is not a metal. It can behave like an alkali metal or a non-metallic halogen. For this reason, hydrogen is placed above either the alkali metals or the halogens in the periodic table. However, hydrogen is very different from both the alkali metals and the halogens.