Which group of elements include lithium, sodium, potassium, rubidium, caesium, and francium?

Q.

Which group of the modern periodic table include lithium, sodium, potassium, rubidium, caesium, and francium?

Q.

Arrange the following elements in the increasing order of their ionization energy: Sodium, Cesium, Lithium, Rubidium

Q. The chemical elements, caesium, and rubidium, both of which are metals, were discovered by splitting:

Q. Why are potassium and caesium, rather than lithium used in photoelectric cells?

Q. Why are potassium and caesium used, rather than lithium used in photoelectric cells?