The atomic number of an element represents the number of protons in the nucleus of its atoms. In this case, the element X has an atomic number of 14, indicating it has 14 protons.
The relative atomic mass (also known as atomic mass or atomic weight) represents the weighted average mass of the isotopes of an element, taking into account their abundance. Since the atomic mass of element X is given as 28, it represents the combined mass of protons and neutrons in the nucleus.
To calculate the number of neutrons, subtract the atomic number (number of protons) from the atomic mass:
Number of neutrons = Atomic mass - Atomic number = 28 - 14 = 14
Therefore, atom X contains 14 neutrons.