Sites

http://wiki.answers.com/Q/What_are_the_names_of_potassium's_family_members
http://www.chemicalelements.com/elements/k.html

Bohr Model

Family and group

Potassium's family are "Alkali" metals.
Hydrogen,Lithium,Sodium,Rubidium, Caesium,and Francium are all members with potassium.
There group number is one.

potassium

Potassium was discovered in 1807 by Sr.Humphry Day.
I'ts Atomic number is 19.
Potassium Atomic mass is 39.098.
Potassium's state of matter at room temperature is a solid.
It's a Metal.
Potassium is a silvery color.
Potassium at boiling point is 774.0C°, at boiling point 63.65C°.

Potassium's period number is 4.

Potassium's symbol is K.

Potassium comes from the English word Potash meaning Potassium salt.

Bananas have potassium in them.