isoelectronic
As3 plus. It is As3-
A selenide contain the anion Se(2-).
Options are not given in the question. But the following species will have the same electronic configuration as Br- ion: Neutral atom: Kr Cations: Rb+, Sr2+ Anion: Se2-
2Na+ + CO32- + Sr2+ + 2Cl- --> SrCO3 + 2Na+ + 2Cl- Simplified: Sr2+ + CO32- --> SrCO3 (s)
Sr2 is acidic.
The atomic ratio Sr/Br is 2.
suevey,read,review
possibly Sr2+O2-
understand and remember more of what you read.
Strontium form the divalent cation Sr2+.
The strontium ion is positive, divalent, Sr2+.
Sr has 38 protons, 38 electrons, and 50 neutrons.