Given the equation representing a nuclear reaction which X represents a nuclide

Answer is in the file below

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the role of the microscope world in creating new materials .

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.