Multiple choice general knowledge science & technology

What differentiates one element from another?

  1. The number of neutrons

  2. The number of protons

  3. The number of electrons

  4. The number of ions
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The number of protons (atomic number) uniquely defines each element. Neutrons vary among isotopes, electrons change in ions, and ions are charged particles, not element identifiers.

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