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Atoms are made from a nucleus of protons and neutrons and a cloud of electrons.
Atoms are made from a nucleus of protons and neutrons and a cloud of electrons.
A.正确
B.错误
正确答案：正确
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材料导论
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The Pauli exclusion principle is the quantum mechanical principle which states that two or more identical fermions（particles with half-integer spin）can occupy the same quantum state within a quantum system simultaneously.
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Metal atoms become anions after they lost electrons.