Multiple Choice
The ozone layer absorbs most of the incoming _____ radiation.
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2. Atoms & Elements
The Atom
Multiple Choice
Which element is the most abundant in air and has an atomic number of 7?
A
Oxygen
B
Carbon
C
Hydrogen
D
Nitrogen
Verified step by step guidance1
Identify the atomic number given in the problem, which is 7.
Recall that the atomic number corresponds to the number of protons in an element's nucleus and uniquely identifies the element.
Use the periodic table to find the element with atomic number 7; this element is Nitrogen (N).
Understand that Nitrogen makes up about 78% of the Earth's atmosphere, making it the most abundant element in air.
Confirm that the other options (Oxygen, Carbon, Hydrogen) have different atomic numbers and are less abundant in air compared to Nitrogen.
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