Multiple Choice
In a neutral atom, how many principal energy levels (shells) are possible according to the quantum mechanical model?
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2. Atoms & Elements
The Atom
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Which of the following is the smallest unit of an element that still retains the chemical properties of that element?
A
Molecule
B
Atom
C
Proton
D
Electron
Verified step by step guidance1
Understand the question is asking for the smallest unit of an element that retains its chemical properties.
Recall that an element is made up of atoms, which are the basic units that define the element's identity and chemical behavior.
Recognize that a molecule is a group of atoms bonded together, so it is not the smallest unit of an element but rather a combination of atoms.
Note that protons and electrons are subatomic particles within an atom, but individually they do not retain the chemical properties of the element.
Conclude that the atom is the smallest unit of an element that still retains the chemical properties of that element.
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