Direction: Please determine the correct answer for each of the following problems.

Problem 1

Sulfur (S) has the atomic number 16, how many protons are in the nucleus of a sulfur atom?

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Problem 2

Sodium (Na) has 11 protons, 11 neutrons and 11 electrons, what is the approximate atomic mass of a sodium atom?

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Problem 3

Magnesium (Mg) has 12 protons, 12 neutrons and 12 electrons, what is the atomic number of magnesium?

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