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| Question | Answer |
| What is the charge of a proton? 1+ 0 1- | The charge of a proton is 1+. This is also called positive. |
| What is the charge of an electron? 0 1+ 1- | The charge of an electron is 1-. This is also called negative. |
| What is the mass of a neutron? 2 Almost zero 1 | The mass of a neutron is 1. This is the same as a proton. |
| What is the mass of an electron? Almost zero 1 1- | The mass of an electron is almost zero. |
| What is the charge of an ion which has lost an electron? Neutral Positive Negative | The charge of an ion that has lost an electron is positive because electrons have a negative charge. |
| What is the charge of an ion which has gained an electron? Positive Neutral Negative | An ion that has gained an electron has a negative charge because electrons have a negative charge. |
| What is the atomic number of an atom? The number of neutrons The number of protons The number of electrons | The atomic number of an atom is the number of protons it contains. |
| What is the mass number of an atom? The number of protons and neutrons The number of protons and electrons The number of electrons and neutrons | The mass number of an atom is the number of protons and neutrons. |
| What are isotopes? Atoms of the same element with different numbers of electrons Atoms of the same element with different numbers of protons Atoms of the same element with different numbers of neutrons | Isotopes are atoms of the same element with different numbers of neutrons. |
| How many neutrons does hydrogen-3 have? 2 1 0 | Hydrogen-3 has one proton and two neutrons. |
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