Answer
Alkaline earth metals are more dense and harder than alkali metals
Step-by-step explanation
The alkaline earth metals are the elements that belong to group 2 of the periodic table. This group of elements includes beryllium, magnesium, calcium, strontium, barium, and radium. Alkali metals, on the other hand, belong to group 1 of the periodic table. Alkaline earth metals have more density and are harder than alkali metals.