All Acronyms. CTA - Control Terminal Agency [Internet]; April 13, 2017 [cited 2017 APR 13]. Available from: https://www.allacronyms.com/CTA/Control_Terminal_Agency.
There are almost 120 known elements. For example, you are made up of billions of billions of atoms but you probably won't find more than 40 elements (types of atoms) in your body. Chemists have learned that over 95% of your body is made up of hydrogen (H), carbon (C), nitrogen, oxygen, phosphorus (P), and calcium (Ca).
Copper The number of protons in an atom of an element is the same as the atomic number. So finding the number of protons in an atom just consists of looking at a periodic table. Copper's atomic number is 29, so it has 29 protons. In a neutral atom, the number of electrons will equal and balance the number of protons, so it would also be 29 electrons.