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GIZMOS 2026 FINAL PAPER QUESTIONS AND VERIFIED SOLUTIONS

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GIZMOS 2026 FINAL PAPER QUESTIONS AND VERIFIED SOLUTIONS

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GIZMOS
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GIZMOS

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GIZMOS 2026 EXAM REVIEW FULL
QUESTIONS AND SOLUTIONS


◉What are the stable isotopes of carbon . Answer: Carbon-12 and
carbon-13


◉What are the stable isotopes of nitrogen . Answer: Nitrogen-14 and
nitrogen-15


◉List two radioactive isotopes of oxygen . Answer: Oxygen-15 and
oxygen-19


◉How many electrons are in a neutral atom of lithium . Answer:
Three


◉How many neutrons are in an atom of Mg-25 . Answer: Thirteen


◉What is the mass number of an atom with 5 protons and 7
neutrons . Answer: Twelve


◉When an atom is charged, it is called an ion. How many electrons
are in O2- . Answer: Ten
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