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Yttrium has an atomic number of 39. Which electron configuration best represents yttrium?
238
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10. Periodic Properties of the Elements
The Electron Configuration
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How many electrons are present in a neutral atom of zirconium (Zr)?
A
91
B
40
C
56
D
22
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Identify the atomic number of zirconium (Zr) from the periodic table. The atomic number represents the number of protons in the nucleus of the atom.
Recall that a neutral atom has an equal number of protons and electrons to balance the charge.
Since zirconium is neutral, the number of electrons equals its atomic number.
Look up the atomic number of zirconium, which is 40.
Conclude that a neutral atom of zirconium contains 40 electrons.
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