The radioactive isotope of hydrogen is called___________?
Correct answer: A. tritium
- A. tritium
- B. deuterium
- C. protium
- D. ortho-hydrogen
Explanation
Tritium is hydrogen-3, containing one proton and two neutrons, and it is radioactive. Deuterium is hydrogen-2 and protium is hydrogen-1, and both are stable isotopes. The likely mistake is choosing deuterium because it is also a named hydrogen isotope, but it is not radioactive.
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Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
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