Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.
- Helium
- Argon
- Neon
- Krypton
Correct Answer: (b) Argon
Explanation:
K has 19 electrons but on losing one electron it forms K+ containing 18 electrons. Cl has 17 electrons, it gains one electron to become Cl- containing 18 electrons. The atomic number of argon is 18. Hence, Argon is a neutral atom in the periodic table that has the same number of electrons as K+ and Cl-.
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