If element X has 81 protons, how many electrons does it have?

If element x is neutral then it will also have 81 electrons.

To find the number of electrons in an atom, we need to know its atomic number or number of protons. In this case, element X has 81 protons. Since the number of electrons in a neutral atom is equal to the number of protons, element X must also have 81 electrons.

You can determine the number of protons for any element by referencing the periodic table. Each element is assigned a unique atomic number, which corresponds to the number of protons in the nucleus of its atoms.