Multiple choice general knowledge science & technology

When radium (atomic number 88) emits alpha particle, the resulting nucleus has atomic number

  1. 92

  2. 90

  3. 88

  4. 86
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Alpha particle emission reduces atomic number by 2 because the alpha particle carries away 2 protons. Radium-88 becomes radon-86 with atomic number 86.

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