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All atoms of a given element have the same what?
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4. Atoms and Elements
The Atom (Simplified)
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In a simplified atomic model, what distinguishes one chemical element from another?
A
The number of protons in the nucleus (atomic number)
B
The number of electrons in the outermost energy level
C
The total mass of the atom
D
The number of neutrons in the nucleus
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Understand that a chemical element is defined by a unique characteristic of its atoms.
Recall that atoms consist of protons, neutrons, and electrons, where protons and neutrons are in the nucleus and electrons orbit around.
Recognize that the number of protons in the nucleus, called the atomic number, uniquely identifies an element and determines its chemical properties.
Note that while electrons influence chemical behavior and neutrons affect isotope identity, neither changes the element itself.
Conclude that the distinguishing factor between elements in this simplified atomic model is the number of protons in the nucleus, or the atomic number.
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