* Isotopes: Elements can have different forms called isotopes. Isotopes of the same element have the same number of protons (defining the element) but different numbers of neutrons.
* Einsteinium's Isotopes: Einsteinium has several isotopes, with the most common being Einsteinium-253 (²⁵³Es). This isotope has 99 protons (as all einsteinium atoms do) and 154 neutrons (253 - 99 = 154).
* Other Isotopes: However, other isotopes of einsteinium exist, such as ²⁵⁴Es, ²⁵⁵Es, etc., with different numbers of neutrons.
Therefore, to determine the number of neutrons in an einsteinium atom, you need to know which specific isotope you're dealing with.
