How many electrons are present in a neutral atom of zirconium (Zr)?

• A. 91
• B. 40
• C. 56
• D. 22

Answer: (B)

Verified step by step guidance

1. 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.
2. Recall that a neutral atom has an equal number of protons and electrons to balance the charge.
3. Since zirconium is neutral, the number of electrons equals its atomic number.
4. Look up the atomic number of zirconium, which is 40.
5. Conclude that a neutral atom of zirconium contains 40 electrons.