Which of the following representations is correct for an atom X with 28 electrons and…

Physics WAEC 2004

Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?

  • \(^{30}_{28} X\)
  • \(^{28}_{30} X\)
  • \(^{58}_{30} X\)
  • \(^{58}_{28} X\) checkmark

The correct answer is: D

Explanation

\(X^{A = p + n = 28 + 30 = 58}_{Z = P = E = 28}\)
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