Tungsten has 74 protons. With 68 electrons, it would have a charge of +6.
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The charge of an ion is determined by the number of electrons it has gained or lost compared to its neutral state. Tungsten has 74 electrons in its neutral state, so if it has 68 electrons, it has lost 6 electrons and would have a charge of +6.
If an ion has more electrons than protons, it would have a negative charge. The charge of the ion would be equal to the excess of electrons over protons.
The ion would have a positive charge equal to the difference between the number of protons and electrons. For example, if there are 10 protons and 8 electrons, the ion would be a 2+ charged ion.
The ion would have a positive charge if it has more protons than electrons. Since protons have a positive charge and electrons have a negative charge, an excess of protons will result in an overall positive charge for the ion.
The charge on an ion is equal to the number of protons minus the number of electrons. In this case, the ion would have a charge of +2 (75 protons - 77 electrons).
An ion with 18 electrons and a charge of -3 would be a chlorine ion (Cl^-). Chlorine normally has 17 electrons, but gaining one electron to form a chloride ion would give it a total of 18 electrons and a charge of -1. To have a charge of -3, two more electrons would need to be gained, resulting in a chloride ion with 18 electrons and a charge of -3.