1.) how many periods are on the periodic table? are periods the columns or the rows on the periodic table?

There are 8 periods. The periods are the rows.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants