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Which of the following is a major reservoir of carbon in the Earth's system?
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2. Atoms & Elements
The Atom
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Which element has atoms that contain exactly 11 protons?
A
Sodium (Na)
B
Neon (Ne)
C
Potassium (K)
D
Magnesium (Mg)
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Recall that the number of protons in an atom is called the atomic number, which uniquely identifies each element.
Look up the atomic numbers of the given elements: Sodium (Na), Neon (Ne), Potassium (K), and Magnesium (Mg).
Sodium (Na) has an atomic number of 11, meaning each sodium atom contains exactly 11 protons.
Neon (Ne) has an atomic number of 10, Potassium (K) has 19, and Magnesium (Mg) has 12 protons.
Therefore, the element with atoms containing exactly 11 protons is Sodium (Na).
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