1) The nucleus of an atom contains... a) electrons and protons b) neutrons and protons c) neutrons only d) electrons 2) The atomic number tells us the number of? a) neutrons b) Protons or electrons c) electrons only d) The mass of the atoms 3) An isotope has different numbers of? a) electrons b) protons c) neutrons d) nuclei

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Otomatik olarak kaydedilen geri yüklensin mi: ?