Assuming that the unspecified chart is the Periodic Table, the reason is that they all have one electron in their valency shell.
K; Potassium
Sodium (Na), Lithium (Li), or Potassium (K).
sodium, sodium potassium, potassium lithium, lithium aluminum hydride
In addition to hydrogen, all elements in Group I of the periodic table have one valence electron. They are lithium, sodium, potassium, rubidium, cesium, and francium. The farther you move right on the periodic table the more valence electrons. For example, elements in Group VII have 8 valence electrons except helium.
Hydrogen, Lithium, Sodium, Potassium, Rubidium, Cesium, Francium
Lithium + water = lithium hydroxide + hydrogen Sodium + water = Sodium hydroxide + hydrogen Potassium + water = Potassium hydroxide + hydrogen
Hydrogen, Lithium, Sodium, Potassium, Rubidium, Cesium, and Francium.
Sodium, lithium, potassium
these are in alkali metal groupsso the names are hydrogen, lithium, sodium, potassium, rubidium, caesium
K; Potassium
Potassium is in group 1 and the group elements are hydrogen, lithium, sodium, potassium, rubidium, cesium, francium
Sodium (Na), Lithium (Li), or Potassium (K).
sodium, hydrogen, rabidium, potassium,cesium, and francium
sodium, sodium potassium, potassium lithium, lithium aluminum hydride
Lithium: No Sodium: Yes Potassium: Yes Rubidium: No cesium: No
Hydrogen, lithium, sodium, potassium, rubidium, cesium, and francium have one valence electron.
In addition to hydrogen, all elements in Group I of the periodic table have one valence electron. They are lithium, sodium, potassium, rubidium, cesium, and francium. The farther you move right on the periodic table the more valence electrons. For example, elements in Group VII have 8 valence electrons except helium.