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SAT Chemistry

Category - Multiple Choice

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A neutral element has a mass number of 129 and 75 neutrons. What is the identity of this element?

Copper
Tungsten
Rhenium
Uranium
Xenon

Explanation

Answer: Xenon

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 xenon.

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