16. What is the electron configuration of \(\text{Ca}^{2+}\)?(A)\(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2\)(B)\(1s^2 2s^2 2p^6 3s^2 3p^6\)(C)\(1s^2 2s^2 2p^6 3s^2 3p^6 4s^1\)(D)\(1s^2 2s^2 2p^6\)

21. Which of the following statements about buffer solution is NOT true?(A)It resists changes in pH by dilution(B)It resists changes in pH by small addition of acids or bases(C)The most effective buffer solution contains approximately equal concentration of conjugate acid-base pair(D)A concentrate sulfuric acid is a good buffer solution

16. What is the electron configuration of \(\text{Ca}^{2+}\)?

(A)\(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2\)

(B)\(1s^2 2s^2 2p^6 3s^2 3p^6\)

(C)\(1s^2 2s^2 2p^6 3s^2 3p^6 4s^1\)

(D)\(1s^2 2s^2 2p^6\)

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