Question

6. Write the ground state electron configuration of the chromium(VI) cation. Is the chromium(VI) cation paramagnetic or diamagnetic? Explain.

7. Choose the atom with the larger atomic radius from each of the following pairs:

A. Cl or Se B. Mg or Sr C. Cl or Cl- D. Mg or Mg2+

8. Choose the more metallic atom from the following pairs:

A. Ga or Si B. Mg or Sr

9. Choose the atom in each pair that has the greater electron affinity (or more exothermic electron affinity).

A. Al or Cl B. K or F

Answer 1

6.

The general ground state configuration of chromium(Cr) is 1s^2, 2s^2, 2p^6, 3s^2, 3p⁶3d⁵4s¹

The general ground state configuration of chromium (VI) that means is 1s^2, 2s^2, 2p^6, 3s^2, 3p⁶

Now it is completely paired that means it has no magnetic behavior or we can say diamagnetic.

7. As we know , if we go along the group atomic size is increased due to extra addition of shell and decreased along a period due to nuclear charge.

again the size of anion is bigger than cation

A. Cl or Se - Se has large atomic radius

B. Mg or Sr - Sr has large atomic radius

C. Cl or Cl^- - Cl^-has large atomic radius

D. Mg or Mg²⁺ - Mg has large atomic radius

8. Metallic character in a period from left to right decreases and top to bottom increases

A. Ga or Si : Ga has more metallic nature

B. Mg or Sr : Sr has more metallic nature   

9. Electron affinity form left to right in a period increases and top to bottom decreases

A. Al or Cl (Cl has maximum electron affinity)   

B. K or F   (F has maximum electron affinity)