Atomic Properties of K
- Atomic Number of K
- 19
- Atomic Mass of K
- 39.0980 u
- Electron Configuration
- [Ar] 4s1
- Electronegativity
- 0.82
- Block
- s-block
- Group
- 1
- Period
- 4
Potassium is Sodium’s taller, jumpier sibling, the one who startles so easily that even water makes him overdo it.
As a metal, he is soft enough to cut with a knife and reactive enough that water is basically his worst-case scenario. Drop him in and he does not just fizz; he can burst into bright lilac flames like he is trying to win a special-effects contest.
Despite all that, inside living things he is a total professional. Cells depend on potassium ions to help send signals, balance fluids, and keep muscles working, including the important one in your chest. Quietly, he is helping every heartbeat land right on time.
He also has a reputation for hanging out in bananas and other foods, which has turned him into the unofficial mascot of “electrolytes that athletes talk about but rarely define.” He does not mind. Being associated with snacks and sports is better than being remembered only for dramatic lab reactions.
Potassium is proof that an element can be both: wildly reactive in the wrong place and incredibly helpful in the right one.