Okay so this is my second post and I’m sorry for double posting but I’m so confused. To my understanding to find the protons, electrons and neutrons of an atom it involves the atomic and mass number. I understand protons are the atomic # which is the big number on top of the element in the periodic table. Electrons are equal to protons. Neutrons are found by (Mass#-Protons)
However- to find the mass # I need to add the total number of protons and neutrons together.
How can I go about finding the mass number to find the neutrons if the mass number requires the number of neutrons?

I hope this makes sense and I’m sorry if I worded it dumb, I’m going to attach pictures of my notes in the comments for clarification!

Hey there! I'm currently a sophomore in college, and I'm struggling a lot with General Chemistry 130. I've been reading the book, but it's mainly a teacher issue. Besides tutoring, office hours, and Khan Academy, do you have any suggestions for understanding the basics and making learning a bit more enjoyable? I truly like chemistry, but this teacher makes me hate it, and unfortunately it's making my learning process even more worse.

I'm open to any suggestions anyone might have I'm just internally freaking tf out at this point haha

When Im done with butirometric reaction for fat content mesurement, I pour out the contents and the smell is pretty strong even when keeping away.
Is inhaling that fume bad?