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).
We now know how to find the number of protons and the number of electrons for a given atom, but what about neutrons? How many neutrons do atoms of a given element have? It is NOT always the same as the number of protons and electrons.e now know how to find the number of protons and the number of electrons for a given atom, but what about neutrons? How many neutrons do atoms of a given element have? It is NOT always the same as the number of protons and electrons.