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UPCAT Science practice question 15: The identity of a chemical element is determined by its number of

Correct answer

D. protons

The proton count is the atomic number, which defines the element. Changing neutrons gives an isotope; changing electrons gives an ion.

The identity of a chemical element is determined by its number of

  1. neutrons
  2. electrons
  3. valence shells
  4. protonsCorrect

Why D is correct

The proton count is the atomic number, which defines the element. Changing neutrons gives an isotope; changing electrons gives an ion.

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