Why aluminum in 1820 had more value than gold​

Aluminum had more value than gold in the 1820s, because it was harder to obtain. Hope this helped :)

i'm assuming that it's c.) red bank..

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).