* Strontium's Atomic Number: Strontium (Sr) has an atomic number of 38, which means it has 38 protons.
* Calculating the Mass Number: The mass number of an atom is the sum of protons and neutrons.
* Mass number = 38 protons + 52 neutrons = 90
* Isotope Notation: The isotope is written as Strontium-90 or ⁹⁰Sr.
Therefore, the isotope of strontium with 52 neutrons is Strontium-90.
