c. Rb plus. Kr has 36 electrons, the same as Se2-, As3+, Sr2+, and Br-. Rb plus has 35 electrons, which is not isoelectronic with Kr.
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-
To convert the concentration of Sr2+ from grams per kilogram to parts per million (ppm), you can use the following formula: 1 ppm = 1 mg/L = 1 mg/kg. Given that the concentration is 0.0079 g/kg, you can convert this to 7.9 mg/kg or 7.9 ppm.
In a neutral compound, the ratio of Sr2+ ions to Br- ions would be 1:2 to ensure overall charge neutrality. This means there would be one Sr2+ ion for every two Br- ions in the compound.
Sr2 is pH-neutral because it does not have any effect on the pH of a solution. It is not an acid or a base, so it does not contribute to acidity or basicity.
The balanced ionic chemical equation for the reaction between Na2CO3 and SrCl2 is: Na2CO3(aq) + SrCl2(aq) -> SrCO3(s) + 2 NaCl(aq)
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possibly Sr2+O2-
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Strontium form the divalent cation Sr2+.
The strontium ion is positive, divalent, Sr2+.