The isotope cobalt-60 (60Co27) is used to destroy cancer cells in the human body. Which statements about an atom of cobalt-60 are correct? 1 It contains 33 neutrons. 2. Its nucleus has a relative charge of 27+. 3. It has a different number of neutrons from the atoms of other isotopes of cobalt.
Correct answer: B. 1, 2 and 3 only
- A. 1 and 2 only
- B. 1, 2 and 3 only
- C. 2 and 3 only
- D. 1 only
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About Composition of Atomic Nuclei
Atomic nuclei contain positively charged protons and electrically neutral neutrons, collectively called nucleons. Questions use atomic number, mass number and nuclear notation to identify isotopes, isobars and isotones, and may connect nuclear composition with nuclear charge, mass defect, binding energy and the stability of the nucleus.
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