20 Protons - 搜索图片

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Lead Periodic Table Protons Neutrons And E…
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Boron Protons Neutrons Electrons

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YouTube > Wayne Breslyn (Dr. B.)
What element has 18 protons 20 neutrons and 18 electrons?
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Chem101 4.1 Protons, Neutrons, Electrons in Atoms and Ions
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What Is a Proton?
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Electron Proton Neutron

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