Chemistry Level A
posted by Frances .
I am trying to figure out the number of protons and neutrons in Sodium-24. How would I do that? And how can I figure out what element has 50 protons and 70 neutrons? Thanks for clarifying these questions.
Look at the periodic table. If you know it is Na, the atomic number is 11; therefore, the # protons is 11. The number of nucleons (protons + neutrons) = 24 so the number of neutrons = 24-#protons.
Given that info, the element with 50 protons MUST be element #50. Look at the table and read it off. If it has 50 protons and 70 neutrons, it must have mass number of 70 + 50 = 120. I would think 50120Sn. Check my work.