Multiple Choice
How many electrons are in a neutral barium atom (Ba)?
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9. Electrons in Atoms and the Periodic Table
Electronic Structure: Number of Electrons
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which neutral element has 19 electrons?
A
Sodium (Na)
B
Potassium (K)
C
Calcium (Ca)
D
Argon (Ar)
Verified step by step guidance1
Recall that a neutral atom has an equal number of protons and electrons. Therefore, the number of electrons corresponds to the atomic number of the element.
Identify the atomic numbers of the given elements: Sodium (Na) has atomic number 11, Potassium (K) has atomic number 19, Calcium (Ca) has atomic number 20, and Argon (Ar) has atomic number 18.
Since the element must have 19 electrons, look for the element with atomic number 19, because the atomic number equals the number of protons and, in a neutral atom, also the number of electrons.
Match the atomic number 19 to the element Potassium (K).
Conclude that the neutral element with 19 electrons is Potassium (K).
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