5.1.2. The nucleus
A subsection of Physics, 5054, through 5. Nuclear physics
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is a diagram that shows the number of particles in a charged atom of beryllium (Be). nucleus electron The charge on an electron is –1.6 × 10–19 C. The charge on the ion is +3.2 × 10–19 C. Deduce, from the charge on the ion, the number of protons in its nucleus. Show your working. number of protons = Write down, in nuclide notation, the symbol for the nucleus of this charged atom. The isotope in is the only stable isotope of beryllium. Explain the term ‘isotope’. Explain what prevents electrons in an atom from escaping.
5054_w22_qp_21
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2022
Paper 2, Variant 1
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