A neutral element has a mass number of 23 and 12 neutrons. What is the identity of this element?
  1. Sodium
  2. Magnesium
  3. Vanadium
  4. Krypton
  5. Iodine
Explanation
Answer: Sodium

The mass number of an element is the number of protons and neutrons in an atom of that element. Subtracting the number of neutrons present from the mass number gives the atomic number. Such a calculation indicates that the unknown in this question is sodium.
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