There are 48 neutrons in the chemical element krypton. This is calculated by subtracting the number of protons from the mass number of krypton. The mass number of krypton is 84, and the number of protons is 36.
Every atom of krypton has 36 protons, but the number of electrons can vary. A stable atom of krypton has 36 negatively charged electrons to cancel out the 36 positively charged protons found in its nucleus. If krypton were to lose one electron, it would become an ion represented by the symbol Kr+. There is a charge of +1 because there are now more positive charges in the atom than negative charges.