Question

How are the elements arranged on the periodic table?​

Answer 1

Answer:

They are arranged by increasing atomic mass/number. Atomic mass/number is identified by the amount of protons in the element. For example, Helium has an atomic mass of 2. That means it has 2 protons. Groups are identified when elements have similar properties, and periods are the rows of elements with the same number of electron shells.

I hope this helps!

PLEASE MARK BRAINLIEST!