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Which subatomic particle is massive and located at the center of the atom?
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2. Atoms & Elements
The Atom
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Which of the following best completes the statement: An element is made up of ____?
A
ions with varying numbers of neutrons
B
compounds formed by chemical reactions
C
atoms that all have the same number of protons
D
molecules composed of different types of atoms
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Recall the definition of an element in chemistry: An element is a pure substance consisting entirely of one type of atom.
Understand that atoms of the same element have the same number of protons, which defines the element's identity.
Recognize that ions are charged species and can be formed from atoms, but an element itself is not made up of ions with varying neutrons.
Note that compounds are substances formed from two or more different elements chemically bonded, so an element is not made up of compounds.
Molecules composed of different types of atoms represent compounds, not elements; therefore, the best completion is 'atoms that all have the same number of protons.'
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