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What is the mass number of an atom that contains 5 protons and 7 neutrons?
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2. Atoms & Elements
The Atom
Multiple Choice
Which of the following determines the identity of an element?
A
The number of electrons in the atom
B
The number of protons in the nucleus
C
The number of neutrons in the nucleus
D
The total mass of the atom
검증된 단계별 안내1
Understand that the identity of an element is defined by a unique characteristic of its atoms.
Recall that atoms consist of protons, neutrons, and electrons, each with different roles.
Recognize that the number of protons in the nucleus, called the atomic number, uniquely identifies an element.
Note that the number of electrons can vary in ions, and the number of neutrons can vary in isotopes, but these do not change the element's identity.
Conclude that the total mass of the atom is not a defining factor for the element's identity since it depends on both protons and neutrons.
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