Answer:
i think it is chemical wait no physical
Explanation:
In 1869, just five years after John Newlands put forward his law of octaves, a Russian chemist called Dmitri Mendeleev published a periodic table. Mendeleev also arranged the elements known at the time in order of relative atomic mass, but he did some other things that made his table much more successful.
i hope this helps in some way!
I think the answer is A. 28 because you add 27 + 1 = 28 and add the 13AL and makes 2813AL
I Hope Its Helps