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Portable Network Graphic  |  1991-11-09  |  2.6 KB  |  512x342  |  4-bit (3 colors)
   ocr: 20 Click on the best answer 19 - lerm used to decscribe an electron jumping from a lower's' orbital to a higher p'or d'orbital 12 15 13 (allow 4 seconds to reset after wrong answers)