Final answer:
Potassium (K) is more likely than Selenium (Se) to give up an electron due to its single valence electron, which it readily loses to form a K+ cation with a noble gas electron configuration.
Step-by-step explanation:
Between Potassium (K) and Selenium (Se), Potassium (K) is more likely to give up an electron to form an ion. Potassium, with an atomic number of 19, has just one valence electron in its outer shell, which makes it energetically favorable for it to lose that one electron and form a K+ cation, achieving a stable noble gas electron configuration similar to Argon ([Ar]). Selenium, on the other hand, is more likely to gain electrons to complete its valence shell because it is a non-metal and typically forms anions.
Potassium (K) is more likely to give up an electron to form an ion compared to Selenium (Se).
Potassium has one electron in its valence shell, making it highly likely to participate in chemical reactions in which it donates one electron. This is because it is easier for potassium to donate one electron than to gain seven electrons. The resulting potassium ion will be slightly positive, written as K+.