Multiple Choice
Which of the following elements does NOT occur naturally as a diatomic molecule?
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2. Atoms & Elements
Periodic Table: Elemental Forms
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Which one of the following elements does NOT occur as a diatomic molecule in its elemental form?
A
Nitrogen (N_2)
B
Hydrogen (H_2)
C
Oxygen (O_2)
D
Helium (He)
Verified step by step guidance1
Understand that diatomic molecules are molecules composed of two atoms of the same element bonded together. Common diatomic elements in their elemental form include hydrogen (H_2), nitrogen (N_2), and oxygen (O_2).
Recall that elements in their elemental form can exist as single atoms (monatomic) or as molecules made of multiple atoms (diatomic or more).
Identify the elements given: Nitrogen (N_2), Hydrogen (H_2), Oxygen (O_2), and Helium (He).
Recognize that Nitrogen, Hydrogen, and Oxygen naturally exist as diatomic molecules (N_2, H_2, O_2) because they form stable bonds with themselves to achieve a full valence shell.
Note that Helium (He) is a noble gas with a full valence shell and is chemically inert, so it exists as single atoms (monatomic) rather than diatomic molecules.
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