It's these two numbers, 20 and 13, that are used to make up the Tzolk'in calendar, the first calendar used by the Mayans. 1  1. 2  2. 3  3. 4  4. â¦. 5  5. 6.  NEXT.
Making the world better, one answer at a time. the nucleus is made up ofneutrons and protons. on the outside of the nucleus is the electrons. the nucleus is made up ofneutrons and protons. <br/>on the outside of the nucleus is the electrons.
everything is made up of atoms. Atoms consist of the. nucleus and negatively charged particles surrounding. the nucleus called electrons. Inside of the nucleus. are protons(positively charged particles)and neutrons. neutral particles). If the atom is not an isotope we. know that there must be an equal amount of protons and. neutrons. We also know that there has to be at least. one proton and one neutron inside of the nucleus.