Which of the following statements is true when potassium atom forms its ion?

Here are the solutions to the questions from the image:

1. Which of the following statements is true when a potassium atom forms its ion?

• A neutral potassium atom (K) has 19 electrons. To form a stable ion, it loses one electron to become a potassium ion ($\text{K}^+$) with 18 electrons. This electronic configuration is the same as that of the noble gas Argon (Ar), which has a stable octet.

The correct option is C.

2. The formula of element X having 19 electrons with oxygen is

• An element with 19 electrons is Potassium (K). Potassium is in Group 1 and typically forms a $\text{X}^+$ ion (loses one electron).
• Oxygen