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alodium    
n. 自主地[封建时代的]

自主地[封建时代的]


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  • Nitrogen - Wikipedia
    Nitrogen is a chemical element; it has symbol N and atomic number 7 Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table, often called the pnictogens It is a common element in the universe, estimated at seventh in total abundance in the Milky Way and the Solar System
  • Nitrogen – Atomic Mass – Atomic Weight – N - Periodic Table of . . .
    Atomic mass of Nitrogen is 14 0067 u The atomic mass is the mass of an atom The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element
  • Nitrogen (N) - Periodic Table
    Nitrogen is the 7th element in the periodic table and has a symbol of N and atomic number of 7 It has an atomic weight of 14 007 and a mass number of 14 Nitrogen has seven protons and seven neutrons in its nucleus, and seven electrons in two shells It is located in group fifteen, period two and block p of the periodic table
  • Nitrogen - Element information, properties and uses | Periodic Table
    Element Nitrogen (N), Group 15, Atomic Number 7, p-block, Mass 14 007 Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images
  • Nitrogen (N) - Periodic Table
    Nitrogen is a chemical element of the periodic table with chemical symbol N and atomic number 7 with an atomic weight of 14 0064 u and is classed as nonmetal and is part of group 15 (nitrogen group)
  • Nitrogen | Definition, Symbol, Uses, Properties, Atomic Number, Facts . . .
    The atmosphere of Earth consists of 75 51 percent by weight (or 78 09 percent by volume) of nitrogen; this is the principal source of nitrogen for commerce and industry
  • Atomic Weight of Nitrogen | Commission on Isotopic Abundances and . . .
    Therefore, the accuracy and precision of the standard atomic weight of nitrogen are limited almost entirely by real variations, hence the annotation "r" Measurable variations in the isotope abundances (and atomic weights) of nitrogen are found in most nitrogen compounds
  • Nitrogen | N2 | CID 947 - PubChem
    Dinitrogen is an elemental molecule consisting of two trivalently-bonded nitrogen atoms It has a role as a member of food packaging gas and a food propellant It is a gas molecular entity, an elemental molecule and a diatomic nitrogen It is a conjugate base of a diazynium
  • Atomic Data for Nitrogen (N ) - NIST
    Atomic Data for Nitrogen (N) Atomic Number = 7 Atomic Weight = 14 00674 Reference E95 N I Ground State 1 s2 2 s2 2 p3 4 S° 3 2 Ionization energy 117225 7 cm -1 (14 5341 eV) Ref M75a N II Ground State 1 s2 2 s2 2 p2 3 P 0 Ionization energy 238750 3 cm -1 (29 6013 eV) Ref E83
  • Atomic Number of Nitrogen N
    Chemical symbol for Nitrogen is N Number of protons in Nitrogen is 7 Atomic weight of Nitrogen is 14 007 u or g mol Melting point of Nitrogen is -209,9 °C and its the boiling point is -195,8 °C





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