Chemical symbol: K
Atomic number: 19
Atomic mass: 39.098
Group: 1 (Hydrogen and Alkali metals)
Period: 4
Element category: Alkali metals
Block: s-block
Number of protons: 19
Number of electrons: 19
Number of neutrons (in the most common isotope): 20
Sources:
Knowledge Encyclopedia (book)
SCIENCIA (book)