Question

which of the two ions ca+2orZn+2 is more stable why??​

Answer 1

$Cu^{+2}$ ion is more stable.

• The atomic number of calcium is 20. After removing two electrons the total electron of calcium becomes 18.
• The electronic configuration of Calcium ions is-
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6}$
• So, it has attained noble gas like configuration where the 3p orbital is filled and highly stable.
• Zn has a total of 30 electrons so, after removing two electrons it has 28 electrons. So, it does not attain a noble gas configuration and low stable.