Which of these periods contain elements with electrons in s, p, d, and forbitals?
a periods 1-3
b. periods 1-4
c. periods 3-5
d. periods 6-7

I learnt k,l,m

Explanation:

so 1-3periods have klm and after that klmn

The periods that would contain elements with electrons in s, p, d, and f orbitals are periods 6-7

Explanation:

lol idk man i guess u gotta ask bill nye the science guy

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.