Alkaline earth metals are denser and harder than alkali metals.

The statement "Alkaline earth metals are denser and harder than alkali metals" can be explained based on the periodic table and the atomic structure of these two groups of elements.

1. Atomic Structure:
   - Alkali metals belong to Group 1 of the periodic table and include elements such as lithium (Li), sodium (Na), and potassium (K). They have a single electron in their outermost shell, which is relatively far from the nucleus.
   - Alkaline earth metals, on the other hand, belong to Group 2 and include _________ __________ _________ ____ _____ __________.
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