Multiple Choice
Which neutral atom is isoelectronic with (i.e., has the same number of electrons)?
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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
How many electrons are in a neutral barium atom (Ba)?
A
52
B
56
C
138
D
88
Verified step by step guidance1
Identify the atomic number of barium (Ba) from the periodic table. The atomic number represents the number of protons in the nucleus of an atom.
Recall that in a neutral atom, the number of electrons equals the number of protons to balance the positive charge of the nucleus.
Use the atomic number of barium as the number of electrons in a neutral barium atom.
Write the relationship as an equation: \(\text{Number of electrons} = \text{Atomic number of Ba}\).
Conclude that the number of electrons in a neutral barium atom is equal to its atomic number.
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