Isotopes differs in______________________?
Correct answer: C. properties depend upon mass
- A. arrangement of electrons in orbitals
- B. position in the periodic table
- C. properties depend upon mass
- D. chemical properties
Explanation
Isotopes are atoms of the same element with the same atomic number but different mass numbers, because they contain different numbers of neutrons. Their chemical properties are nearly the same because their electron arrangements are the same, although some physical properties depend on mass. Option c is the intended statement, while option d is the common mistake caused by confusing isotopic mass effects with chemical behaviour.
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About Discovery of the Proton
The discovery of the proton follows the study of positive rays, also called canal rays, observed in discharge tubes and later identified as positively charged particles. The work of Goldstein and Rutherford is linked to the proton's charge, relative mass and role in the nuclear model, distinct from the discovery of the electron.
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