The arrangement of the electrons in an atom
2 marks · EasyRubidium (Rb) has atomic number 37. Calculate the number of protons and electrons in a neutral atom of rubidium.
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37 protons and 37 electrons
Also accept: Protons = 37, electrons = 37
Common mistakes: Giving only one number; Mixing up protons and electrons
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Marking points
M1 · 1 mark · Identifies number of protons is atomic number: 37.
A1 · 1 mark · States number of electrons in a neutral atom: 37.
Worked solution
Number of protons = atomic number = 37.
A neutral atom has the same number of electrons as protons, so electrons = 37.