Hydrogen (H). Diagram of the nuclear composition,electron configuration,chemical data,and valence orbitals of an atom of hydrogen-1 (atomic number: 1),the most common isotope of the element hydrogen. Its nucleus consists of a single proton (red) and no neutrons. A single electron (white) occupies the first of successive electron shells (ring). The stability of an element's outer (valence) electrons determines its chemical and physical properties. Hydrogen is a non-metal in group 1,period 1,and the s-block of the periodic table. At room temperature and pressure it forms a colourless gas (H2) that liquefies at minus 253 degrees Celsius | |
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Credit: | Science Photo Library / Clarivan, Carlos |
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