Respuesta :
Answer: [Ar]4s1
Explanation: Potassium [tex](K)[/tex] is an element with atomic number 19, thus it contains 19 electrons. It is a metal which readily loses its electrons to acquire stable configuration of Argon [tex](Ar)[/tex] which has 18 electrons with completely filled subshells.
[tex]Ar:18:1s^22s^22p^63s^23p^63d^{10}[/tex]
[tex]K:19:[Ar]4s^1[/tex]
