55 as long as Ik I think it’s 55 but I’m Sorry if it’s wrong
The noble gases, because they already have a full valence shell
Answer:
Because the number of neutrons is different, the mass number is different. Isotopes are written in two different ways. They can be written using their symbol with the mass number (to the upper left) and atomic number (to the lower left) or the isotope name is written with a dash and the mass number
Explanation:
I don't know the answer but I am sure this will help you out.
Konichiwa~! My name is Zalgo and I am here to help you out today. The number that you have provided us (0.026890) in Scientific Notation form is "2.6890 × 10^-2".
I hope that this helps! :D
"Stay Brainly and stay proud!" - Zalgo
(By the way, can you mark me as Brainliest? I'd greatly appreciate it! Arigato~! X3)
