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gride    
vi. 擦刮
n. 粗厉的擦刮声

擦刮粗厉的擦刮声


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  • Nitrogen | Definition, Symbol, Uses, Properties, Atomic Number, Facts . . .
    Nitrogen, nonmetallic element of Group 15 [Va] of the periodic table It is a colorless, odorless, tasteless gas that is the most plentiful element in Earth’s atmosphere and is a constituent of all living matter
  • 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
  • What is Nitrogen? (with pictures) - AllTheScience
    Nitrogen is an odorless, tasteless, colorless nonmetallic chemical element which appears in great abundance in the Earth's atmosphere It also appears in a number of other compounds, and is a vital component of life on Earth for many organisms
  • Nitrogen - Properties, Reactions, Compounds | Britannica
    Nitrogen is a colourless, odourless gas, which condenses at −195 8 °C to a colourless, mobile liquid The element exists as N 2 molecules, represented as :N:::N:, for which the bond energy of 226 kilocalories per mole is exceeded only by that of carbon monoxide, 256 kilocalories per mole
  • Nitrogen Facts, Symbol, Discovery, Properties, Uses
    Nitrogen (pronounced as Nye-treh-gen) is a chemical element, existing in the form of a colorless diatomic gas Denoted by the chemical symbol N, it belongs to the family of nonmetals It is the fifth most abundant element in the earth’s crust, represented by the molecular formula N 2 [1, 2]
  • What is nitrogen guide for KS3 chemistry students - BBC
    Most of the air we breathe is nitrogen, not oxygen Nitrogen in, nitrogen out Nitrogen is inert, which means it doesn’t react with anything in our bodies Nitrogen gas is used in food
  • Nitrogen - Simple English Wikipedia, the free encyclopedia
    Nitrogen Nitrogen is a nonmetal chemical element The atmosphere contains more than 78 percent of nitrogen It has the chemical symbol N and atomic number 7 Its stable inside typically contains 14 nucleons (7 protons and 7 neutrons) It has 5 electrons in its outer shell
  • Nitrogen Element Facts - chemicool. com
    Nitrogen is a colorless, odorless, tasteless, diatomic and generally inert gas at standard temperature and pressure At atmospheric pressure, nitrogen is liquid between 63 K and 77 K
  • Nitrogen | History, Uses, Facts, Physical Chemical Characteristics
    Nitrogen is a chemical element with symbol N and atomic number 7 It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772
  • NITROGEN Definition Meaning - Merriam-Webster
    The meaning of NITROGEN is a nonmetallic chemical element with atomic number 7 that under standard conditions is a colorless, odorless, inert gas, that constitutes 78 percent of the Earth's atmosphere, and that is used especially in the industrial synthesis of ammonia, as a component of inert atmospheres, and in liquid form as a refrigerant





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