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Atomic Nucleus

Provides a simplified description of the atomic nucleus.

What is the question?The atomic number Z of an atom defines what element it is and is determined by how many ________ are in its nucleus.
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OK	Value	Feedback
	electrons	Electrons do not exist in the nucleus. While the number of electrons of a non-ionized atom may equal the number of protons (and thus be equal to atomic number Z), it does not define Z or which element the atom belongs to.
	nucleons	The number of nucleons in the nucleus is the mass number A; it is the sum of the atomic number N and the neutron number Z (A = N + Z).
	neutrons	The number of neutrons in the nucleus is called the neutron number N.
	protons	Correct!

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