The lowest atomic number ion is Se^2-.
The highest atomic number ion is Sr^2+.
The ones in the middle are NOT Br^- or Rb^+. However, I do not know what the correct answer for those two is.
Pallidium
[Ar] 3d2 4s2
The element with the electron configuration Kr 5s^2 4d^10 5p^2 is Xenon (Xe).
The element with an electron configuration of Kr 4d^6 corresponds to the element Palladium (Pd).
The element E is likely barium (Ba), as its electron configuration is Kr 5s2. The fluoride compound of barium would be BaF2, with barium losing its two valence electrons to form a 2+ cation and fluoride gaining one electron to form a 1- anion.
This electron configuration corresponds to the element Palladium (Pd), which has the atomic number 46. It has the electron configuration [Kr] 5s2 4d10.
No, the electron configuration is incorrect. The correct electron configuration for an element with 52 electrons would be Kr 5s2 4d10 5p6.
The element with the electron configuration Kr 5s2 4d10 5p5 is iodine, which has 53 electrons in total. The electron configuration indicates that iodine has 7 valence electrons in its outermost shell, which is in the 5p subshell.
The electron configuration of zirconium is: [Kr]5s24d2
The noble gas element strontium (Sr) has the electron configuration of [Kr]5s^2. This means that it has the same electron configuration as krypton (Kr), with two electrons in its outermost shell (5s).
Pallidium
Zirconium - but it could be simplified to [Kr] 4d2 5s2
The electron configuration of the element with the atomic number 39 (yttrium) is: [Kr]4d15s2.
NO!!!! Each element has it own ground state electron configuration. Rubidium is [Kr] 5s1 Strontium is [Kr] 5s2. Notice that strontium has one MORE electron than Rubidium. The symbol [Kr] is shorthand for the full electron configuration of krypton.
antimony
[Ar] 3d2 4s2
The electron configuration of Xenon is [Kr] 4d10 5s2 5p6.