Please describe how we determine valence electrons in the main 8 octet groups, like how certain families have certain amounts. Explain, in complete sentences how we know things like Sodium has one valence electron and Chlorine has 7.

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

the answer is the first option

explanation:

just googled it m8. not that hard

lol

a:

by the combination of an unlimited number of elements