By Derek M. Kwait
Updated Mar 24, 2022
Krypton, a noble gas with atomic number 36, is best known as Superman’s kryptonite, but its chemistry is equally fascinating. Understanding its atomic structure unlocks its properties and real‑world uses—from lighting to high‑pressure gas applications.
Determine the counts of each particle. Krypton’s atomic number is 36, so it contains 36 protons and 36 electrons. The atomic mass is 83.798, which rounds to 84. Subtracting protons gives 48 neutrons (84 – 36 = 48). You’ll need 84 large Styrofoam spheres for the nucleus (protons + neutrons) and 36 smaller spheres for the electrons.
Choose Styrofoam balls in two sizes: 84 larger ones for the nucleus and 36 smaller ones for the electrons. Styrofoam is inexpensive, easy to paint, and can be punctured with metal rods for the electron positions.
Paint the balls to distinguish particle types: 36 larger balls one color for protons, 48 the same size another color for neutrons, and all 36 smaller balls a third color for electrons.
Glue the 84 large balls together to form a compact nucleus. Allow the adhesive to cure fully before proceeding.
Attach an electron ball to one end of each metal rod while the glue dries. The rods will later hold electrons on both ends, with the nucleus positioned centrally.
Insert the shortest rod first—representing the 1s energy level with two electrons. Follow with four medium rods for the 2s level (8 electrons), nine longer rods for the 2p/3s levels (18 electrons), and four longest rods for the outer 3p level (8 electrons). Place rods at varied angles to illustrate the dynamic electron cloud.
Provide a card that explains the model: color assignments, counts of each particle, electron distribution across energy levels, and key facts such as atomic mass, periodic table position, common state of matter, terrestrial abundance, and industrial applications.
