Nitrogen (and oxygen and hydrogen) in the form of a gas is usually found as a molecule of two atoms of Nitrogen. That is N2. The fairly weak bond can be broken chemically, by heat, etc, and then you would have N.
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N-nitrogen refers to nitrogen in its elemental form, typically found in compounds like ammonia. N2-nitrogen gas specifically refers to the diatomic nitrogen molecule, which is the most abundant form of nitrogen in Earth's atmosphere.
The key difference between a liquid and a gas is their molecular arrangement. In a liquid, the molecules are loosely packed and have some degree of attraction between them, allowing the liquid to maintain a fixed volume but take the shape of its container. In a gas, the molecules are far apart and have very weak interactions, leading to the gas expanding to fill its entire container.
Ammonia gas is a compound composed of one nitrogen atom bonded to three hydrogen atoms. Ammonia ion, on the other hand, is the ionic form of ammonia that has gained a hydrogen ion (proton) to become NH4+. This means ammonia ion has a positive charge, while ammonia gas is neutral.
Vaporization is the process of a substance changing from a liquid to a gas, sublimation is the process of a substance changing directly from a solid to a gas, and condensation is the process of a gas changing to a liquid. Each process involves the transformation of matter between different states.
Ammonia gas refers to a compound with the formula NH3, which is a gas composed of nitrogen and hydrogen atoms. Ammonium trihydride, on the other hand, is not a recognized chemical compound. It seems to be a misnomer, as the correct name for the compound with the formula NH3 is ammonia.
The main difference between the states of matter (solid, liquid, gas) lies in how the particles are arranged and how they move. In a solid, particles are tightly packed and vibrate in place. In a liquid, particles are close together but can move past each other. In a gas, particles are far apart and move freely.