Answer these ! 23 points! 1. why is hydrogen set apart by itself? 2. how do valence electron configurations of the alkali metals compare with each other? 3. why are the alkaline-earth metals less reactive than the alkali metals? 4. in which groups of the periodic table do the transition metals belong? 5. what properties do the halogens have in common?

For the first question the answer is

The "s" orbital can only hold a maximum of two electrons. ... Elements in the each group have the same number of valence electrons. Why is hydrogen set apart by itself? Hydrogen does not belong to a single group b/c it can be considered an alkali metal, but it is also a gas.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.

they vary. it used to be meat, grain, bread, candy, beverages, donuts, and fruits/vegetables. now they added exercise in.