What principles or values are violated in the following electronic configuration? i) Boron : 1s25 ii) Nitrogen: 1s 2s 2px 2p. iii) Beryllium : 15 2p3 Write the correct configuration for each of the element​

Ans() ; the burning of them contributes to global warmingthey come from decayed organic material;

Answer is:     molar solubility of  yttrium fluorid is 4.23·10⁻⁶ m. balanced chemical reaction: yf₃(s)  → y³⁺(aq) + 3f⁻(aq). ksp = 8.62·10⁻²¹. ksp = [y³⁺]  · [f⁻]³.[y³⁺] = [yf₃] = s.[f⁻] = 3[yf₃] = 3s.ksp(yf₃)  = s  · (3s)³.8.62·10⁻²¹ = 27s⁴.s(yf₃)  =  ⁴√(8.62·10⁻²¹  ÷ 27).s(yf₃)  = 0.00000423 m.s(yf₃) = 4.23·10⁻⁶ m.

The image seems to be behind the mirror, but nothing is really there.just took the test.

Ibelieve its c, hope this