Answer
The Lewis symbol for $K$ atom is seen in the diagram.
Work Step by Step
RULES TO WRITE LEWIS SYMBOL
- Find out the number of valence electrons in the atom.
- Write the element symbol and around it present each valence electron with one dot to the top, bottom, right or left of that symbol.
- Spread out the dots as much as possible (so there would be minimum electron-electron repulsions), and no spots can hold over 2 electrons.
1) $K$ is in group 1A, so it has 1 electron in the outermost occupied shell. Therefore, $K$ has 1 valence electron.
2) That means in the Lewis symbol, there will be 1 dot only.
That means this dot can take any spot it wants. The choice is arbitrary. You can put this dot in any spot you like.
Eventually, there are 1 spot with one electron, and 3 empty spots.
