What is the correct formula for the compound formed by Ca2+ and NO2?
A. Ca2(NO)2
B. Ca(NO2)2
C. CaNO2
D. Ca2NO2
If you mean NO2^-, that is calcium nitrite and the formula is Ca(NO2)2
The correct formula for the compound formed by Ca2+ and NO2 is C. CaNO2.
To determine the chemical formula for the compound formed by Ca2+ and NO2, we need to apply the crisscross method.
First, write the symbol and charge for each ion:
- Ca2+ represents a cation (positively charged ion) of calcium.
- NO2 represents an anion (negatively charged ion) of nitrite.
Next, we'll crisscross the absolute values of the charges to determine the subscripts for each ion in the formula. The subscript for each ion represents the number of times the element appears in the formula.
The crisscross method involves taking the absolute value of the charge on one ion and using it as the subscript for the other ion. So, the formula would be Ca(NO2)2.
Therefore, the correct formula for the compound formed by Ca2+ and NO2 is B. Ca(NO2)2.