How would you best define nitrogen gas (N2) , as found in the atmosphere?

Question

BlackTom AI · Accepted Answer

The question asks for a definition of nitrogen gas (N2) as found in the atmosphere, so we start by recognizing what N2 is.

The provided answer states: "A pure substance containing diatomic molecules." This aligns with key chemical principles: nitrogen gas in the atmosphere consists of diatomic molecules composed of two identical nitrogen atoms (N≡N). This describes the molecular composition (diatomic) and the fact that N2 is a pure substance, meaning it has a uniform composition throughout and consists of only one chemical species.

To unpack further, nitrogen gas is a homonuclear diatomic molecule, meaning both atoms are nitrogen. The bond between the two nitrogen atoms is a very strong triple bond, which accounts for N2’s relatively inert nature under ordinary conditions and its role as the major component of air (about 78% by volume). The fact that it is a diatomic molecule explains why N2 has distinct physical properties (gas at room temperature, nonpolar, low reactivity under standard conditions) that differ from elemental nitrogen in other forms.

Now, since no other answer options are provided to compare, we cannot evaluate alternative definitions. However, the given statement captures the essential definition: N2 is a pure substance, and it exists as diatomic molecules in the atmosphere.

In summary, the statement correctly identifies N2 as a diatomic molecule and a pure substance, which is the fundamental description of atmospheric nitrogen. It reflects both the composition (two nitrogen atoms per molecule) and the uniform chemical identity (a single substance) present in the atmosphere.

How would you best define nitrogen gas (N2) , as found in the atmosphere?单项选择题

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