The two notations that represent isotopes of the same element is the one that represented in option 1
The lower number is the number of protons while the upper number is the atomic weight
hope this helps
Answer: Yes! you're all good. Alkali metals in group 1 are the most metallic :)
I don’t know but look up the ph of ammonia and if it is below 7 then it is yellow and if it is above 7 then blue