Answer:
Two electrons.
Explanation:
Calcium is the element of second group and forth period. The electronic configuration of Calcium is - 2, 8, 8, 2 or [tex]1s^22s^22p^63s^23p^64s^2[/tex]
There are 2 valence electrons of Calcium.
Iodine is the element of seventeenth group and fifth period. The electronic configuration of Iodine is - 2, 8, 18, 18, 7 or [tex][Kr]4d^{10}5s^25p^5[/tex]
There are 7 valence electrons of iodine.
Calcium iodide, [tex]CaI_2[/tex] is formed when 2 valence electrons of calcium are loosed and they are gained by 2 atoms of iodine.
