Question

give the noble gas electron configuration for the only cadmium ion (element 48). the possible ions are given on the periodic table above the symbol. recall that when forming ions elements tend to end up with completely full and completely empty subshells. 1 52 43 a. b. c. d. e. f. g. h. i. j. o. p. q. r. s. t. u. v. w. x. cc. dd. ee. ff. gg. hh. ii. jj. kk. ll.

Explanation:

Step1: Identify cadmium's position

Cadmium (Cd) is element 48. Its nearest noble - gas with lower atomic number is krypton (Kr), atomic number 36.

Step2: Determine cadmium ion's charge

Cadmium forms a +2 ion ($Cd^{2+}$) by losing 2 electrons.

Step3: Write electron configuration

After losing 2 electrons, the electron configuration starts with the noble - gas core of krypton. Then, since it loses 2 electrons from the outermost shell, the remaining configuration is $[Kr]4d^{10}$. So the noble - gas electron configuration is $[Kr]5s^{0}4d^{10}$.

Answer:

[Kr] 5s⁰ 4d¹⁰