The periodic table
2 marks · HardA neutral atom of silver has an atomic number of 47 and a mass number of 108. Calculate the number of electrons and neutrons in this atom.
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47 electrons; 61 neutrons
Also accept: electrons: 47; neutrons: 61
Common mistakes: Electrons: 108; Neutrons: 47
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Marking points
M1 · 1 mark · Electrons: states that the number of electrons in a neutral atom equals the atomic number (so states 47 electrons).
M2 · 1 mark · Neutrons: calculates number of neutrons as mass number minus atomic number (108 - 47 = 61). Accept 61 neutrons.
Worked solution
Atomic number of silver = 47, so number of electrons = 47 (since the atom is neutral).