Answer :
Final answer:
The net charge of a system consisting of 218 electrons and 185 protons is -33 elementary charges, representing an excess of electrons over protons.
Explanation:
The net charge of a system can be calculated using the number of protons and electrons it contains. Protons have a positive charge, while electrons have a negative charge. For the given system with 218 electrons and 185 protons, the net charge can be determined by subtracting the number of electrons from the number of protons since each proton and electron has an equal but opposite charge magnitude (1 elementary charge).
To find the net charge, we use the formula:
Net charge = (number of protons) - (number of electrons)
Net charge = 185 - 218
Net charge = -33 (since the electrons outnumber the protons, we have a negative net charge)
Each elementary charge is about 1.602 x 10-19 Coulombs, so the system's net charge in Coulombs is:
Net charge (Coulombs) = net charge (elementary charges) x charge of one electron (Coulombs)
Net charge (Coulombs) = -33 x 1.602 x 10-19
Remembering that the negative sign indicates an excess of electrons.
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