Multiple Choice
Which element is the most abundant in Earth's crust by weight?
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2. Atoms & Elements
Periodic Table: Elemental Forms
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Which of the following is an example of an elemental molecule?
A
NaCl
B
O2
C
CO2
D
H2O
Verified step by step guidance1
Understand the definition of an elemental molecule: it is a molecule composed of only one type of element, meaning all atoms in the molecule are identical.
Examine each option to determine if it contains only one type of atom: NaCl contains sodium (Na) and chlorine (Cl), so it is a compound, not an elemental molecule.
CO2 contains carbon (C) and oxygen (O), so it is also a compound, not an elemental molecule.
H2O contains hydrogen (H) and oxygen (O), so it is a compound as well.
O2 consists of two oxygen atoms bonded together, making it a molecule composed of only one element, which fits the definition of an elemental molecule.
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