Multiple Choice
Which subatomic particle, when its number in the nucleus changes, changes an atom’s elemental identity?
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4. Atoms and Elements
Subatomic Particles (Simplified)
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Which subatomic particle determines the identity of an element (i.e., its atomic number)?
A
Alpha particles
B
Protons
C
Electrons
D
Neutrons
Verified step by step guidance1
Understand that the identity of an element is defined by its atomic number.
Recall that the atomic number is the number of protons in the nucleus of an atom.
Recognize that protons carry a positive charge and are unique to each element, distinguishing one element from another.
Note that electrons and neutrons do not determine the element's identity: electrons affect charge and chemical behavior, while neutrons affect isotope variation.
Conclude that the subatomic particle determining the identity of an element is the proton.
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