In other words, atomic mass depends on the number of protons, neutrons and electrons. Out of all the known elements, the Hydrogen element has a least number of protons and electrons.Īs hydrogen has the least number of protons and electrons, it has a least atomic mass. Now in the Hydrogen atom, there is only one proton and only one electron. The mass of an electron is 9.1094 × 10 -31 kg, which is very negligible as compared to mass of protons and neutrons, and so it is generally not considered for calculating the atomic mass. While the electrons that are present in the surrounding orbits are very light. The mass of protons and neutrons is the same and it is 1.6749 × 10 -27 kg. Protons and neutrons are the heavy particles in an atom. The mass of an atom completely depends on the number of protons and number of neutrons present in the nucleus of an atom. Due to this, the total mass of hydrogen atom is the least of all known elements. Hydrogen is the lightest gas because it consists of only one proton and one electron. Electronic configuration of first 30 elements of Periodic table. Detailed Periodic table with electron configuration (Image).Ģ). Well, in the modern printed periodic tables, you can see the Hydrogen element being placed in the group 1 along with the alkali metals.Īpart from having similar properties as that of group 1 and group 17 elements, hydrogen element is placed in 1st group because it has similar outermost electron configuration as that of alkali metals (i.e ns 1).ġ). So where should hydrogen be placed? In group 1 or group 17? So in short, I simply want to say that properties of hydrogen are similar to group 1 elements as well as group 17 elements. Similarly hydrogen also exists as a diatomic molecule (i.e H 2). Hydrogen also forms oxide (i.e H 2O or dihydrogen oxide.)Īlkali metals form sulphides (like Na 2S, K 2S, etc) and hydrogen also forms sulphide (i.e H 2S).Īlkaline metals form halides (like NaCl, KCl, etc) and hydrogen also forms halide (i.e HCl).Īpart from showing similar characteristics like that of group 1 metals, hydrogen also shows similar characteristics as that of halogens (group 17 elements).įor example halogens have very high ionization enthalpy, and hydrogen also have very high ionization enthalpy.Īlso, the halogens exist as diatomic molecules (like F 2, Cl 2, etc). The same chemical property of oxide formation is found in Hydrogen also. HEX (Hexagonal) Melting point of Hydrogen 13.99 K or -259.16 ☌ or -434.49 ☏ Boiling point of Hydrogen 20.271 K or -252.87 ☌ or -423.18 ☏ Density of Hydrogen 0.0898 g/L Main isotope of Hydrogen 1H, 2H Who discovered Hydrogen and when?įor example, group 1 elements form oxides like lithium oxide, sodium oxide, potassium oxide, etc. Protons in Hydrogen 1 Neutrons in Hydrogen 0 Electrons in Hydrogen 1 Symbol of Hydrogen H Atomic mass of Hydrogenġ.008 u Electrons arrangement in Hydrogenġ Electronic configuration of Hydrogen 1s 1 Atomic radius of Hydrogenġ20 picometers (van der Waals radius) Valence electrons in Hydrogenġ 1st Ionization energy of Hydrogen 13.598 eV Electronegativity of HydrogenĢ.2 (Pauling scale) Crystal structure of Hydrogen Group: 1, Period: 1, Block: s Category of Hydrogen element Other Nonmetals Atomic number of Hydrogen, or Hydrogen Element (H) Information Appearance of Hydrogen Colorless gas State of Hydrogen at STP Gas Position of Hydrogen in Periodic table So if you want to know anything about hydrogen element, then this guide is for you.
In fact, the table mentioned below is the perfect information box (Which gives you every single detail about the Hydrogen element in Periodic table.) This is a SUPER easy guide on hydrogen element.
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