The concentration of an allotrope of this element is measured in Dobson units and is present in ozone.

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Multiple Choice

The concentration of an allotrope of this element is measured in Dobson units and is present in ozone.

Explanation:
Dobson units measure how much ozone is in a vertical column of Earth’s atmosphere. Ozone (O3) is an allotrope of the element oxygen, meaning it’s a different structural form of the same element (the common form being O2). In the atmosphere, UV light splits O2 to make atomic oxygen, which can then combine with O2 to form O3. This ozone is what Dobson units quantify, giving typical values in the hundreds of units for the ozone layer. Since the measurement is specifically about ozone, the element involved is oxygen.

Dobson units measure how much ozone is in a vertical column of Earth’s atmosphere. Ozone (O3) is an allotrope of the element oxygen, meaning it’s a different structural form of the same element (the common form being O2). In the atmosphere, UV light splits O2 to make atomic oxygen, which can then combine with O2 to form O3. This ozone is what Dobson units quantify, giving typical values in the hundreds of units for the ozone layer. Since the measurement is specifically about ozone, the element involved is oxygen.

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