An atom of an element X gains two electrons. The symbol of the ion formed is
Answer Details
When an atom gains electrons, it becomes negatively charged, because electrons have a negative charge. The number of electrons gained is equal to the difference between the number of protons and the number of electrons. In this case, the atom of element X gains two electrons, so its charge will be -2. The symbol for an ion with a charge of -2 is X 2-. Therefore, the correct answer is.