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SAT Chemistry

Category - Multiple Choice

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A neutral element has a mass number of 23 and 12 neutrons. What is the identity of this element?

Sodium
Magnesium
Vanadium
Krypton
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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