Which of the two ions Ca+2 Or Zn+2 is more stable. Why?

Answer: Zn²⁺ is more stable than Ca²⁺.Explanation:Electronic configurationCalcium (Ca, Z=20): [Ar] 4s²Ca²⁺ → [Ar] (loses 2 electrons)Noble gas configuration → stable, but not exceptionally.Zinc (Zn, Z=30): [Ar] 3d¹⁰ 4s²Zn²⁺ → [Ar] 3d¹⁰ (loses 2 electrons from 4s)Achieves a completely filled 3d¹⁰ subshell → extra stability.Stability factorCompletely filled orbitals (like d¹⁰) impart greater stability due to symmetrical distribution and exchange energy.Ca²⁺ is stable as an alkaline earth ion, but Zn²⁺ is comparatively more stable because of the filled d-subshell.Final Answer:Between Ca²⁺ and Zn²⁺, Zn²⁺ is more stable because it has a completely filled 3d¹⁰ configuration, whereas Ca²⁺ has only a noble gas configuration without the added stability of a filled d-orbital.

AI Mentor

Check Your IQ

Free Expert Demo

Try Test

Courses

Dropper NEET Course Dropper JEE Course Class - 12 NEET Course Class - 12 JEE Course Class - 11 NEET Course Class - 11 JEE Course Class - 10 Foundation NEET Course Class - 10 Foundation JEE Course Class - 10 CBSE Course Class - 9 Foundation NEET Course Class - 9 Foundation JEE Course Class -9 CBSE Course Class - 8 CBSE Course Class - 7 CBSE Course Class - 6 CBSE Course

Offline Centres

Which of the two ions Ca⁺² Or Zn⁺² is more stable. Why?

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

answer is 1.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

Answer: Zn²⁺ is more stable than Ca²⁺.

Explanation:

Electronic configuration
- Calcium (Ca, Z=20): [Ar] 4s²
  - Ca²⁺ → [Ar] (loses 2 electrons)
  - Noble gas configuration → stable, but not exceptionally.
- Zinc (Zn, Z=30): [Ar] 3d¹⁰ 4s²
  - Zn²⁺ → [Ar] 3d¹⁰ (loses 2 electrons from 4s)
  - Achieves a completely filled 3d¹⁰ subshell → extra stability.
Stability factor
- Completely filled orbitals (like d¹⁰) impart greater stability due to symmetrical distribution and exchange energy.
- Ca²⁺ is stable as an alkaline earth ion, but Zn²⁺ is comparatively more stable because of the filled d-subshell.

Final Answer:

Between Ca²⁺ and Zn²⁺, Zn²⁺ is more stable because it has a completely filled 3d¹⁰ configuration, whereas Ca²⁺ has only a noble gas configuration without the added stability of a filled d-orbital.

Watch 3-min video & get full concept clarity