Answer:
a.) 1+
Step-by-step explanation:
Potassium (K) is located in the first column of the periodic table.
These elements have 1 valence electron. As such, in order to obtain a full octet (8 valence electrons), these elements are likely to lose 1 electron. When this occurs, the element gains an overall charge of 1+ because the positively-charged protons now outnumber the negatively-charged electrons by 1.