Multiple choice general knowledge science & technology Which of these noble gases is used to detect heart defects and fill electronic devices? Neon Argon Radon Krypton Reveal answer Fill a bubble to check yourself D Correct answer Explanation Krypton is used in specialized applications: mixed with other gases to detect heart defects in medical imaging, and used in high-performance electronic devices and flash lamps. Its inert properties make it valuable for precision applications.