Electron structure of sodium:
₁₁Na: 1s²2s²2p⁶3s¹
Answer:

Explanation:
Hello,
In this case, since at 60 °C, 108 grams of ammonium bromide are completely dissolved in 100 grams of water for a saturated solution, once it is cooled to 30 °C, wherein only 83.2 grams are completely dissolved in 100 grams of water, the following mass will precipitate:

Best regards.
The (B) answer (B) is (B) (B) (B)
The answer would be 1,3,1,3