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Formula: N₂
Nitrogen is a chemical element with the symbol N; and ordinary nitrogen gas is the diatomic molecule N₂. Same letter, different level of organization.
Two atoms, one very serious bond
Meet N₂: calm until you untie him.
Nitrogen gas consists of two bonded nitrogen atoms. Their triple bond is very strong, so the molecule is relatively unreactive under normal conditions.
Open molecular file ↓Molecule under the microscope
N–N? No. N≡N. Three ties, no drama...for the most part.
Each N₂ molecule contains two nitrogen atoms connected by a triple bond. This is among the strongest common chemical bonds; N₂ cleavage and conversion therefore require suitable conditions, energy or catalysts.
N
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N
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Triple bond
The N≡N bond has a high bond enthalpy, about 945 kJ/mol in the RSC data. The molecule is therefore kinetically very stable under normal conditions.
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Invisible Gas
At room conditions, N₂ is a colorless, odorless gas. It is about 78% by volume in dry air.
Physical Properties
At −196 °C, it becomes a very cool collaborator.
At normal pressure, nitrogen boils at about 77.4 K or −195.8 °C. Liquid nitrogen is used as a cryogenic coolant, but can cause severe frostbite; the displacement of oxygen in a poorly ventilated room poses a risk of suffocation.
Do not try at home: cryogenic liquids belong in the hands of qualified persons and in the appropriate equipment.
N₂ MOLECULE:
"We are very connected."
LABORATORY TECHNICIAN:
“Great. But I will stay behind the protective glass.”
"We are very connected."
LABORATORY TECHNICIAN:
“Great. But I will stay behind the protective glass.”
Fun fact · silent star of the atmosphere
A lot doesn't mean it's always available.
Although N₂ is a major component of air, most plants and animals cannot use it directly. Some microorganisms can fix atmospheric nitrogen and convert it into chemical forms that enter the biological cycle. Industry, however, converts N₂ into ammonia in the Haber–Bosch process.
Security fine print: Nitrogen is not toxic in the conventional sense, but high concentration can displace oxygen. Since it is odorless, a dangerous lack of oxygen cannot be reliably detected by the senses.
Resources
Numbers from the chemistry lab.
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