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.
1 Atoms are made of extremely tiny particles called protons, neutrons, and electrons. 2  Protons and neutrons are in the center of the atom, making up the nucleus. 3  Electrons surround the nucleus. 4  Protons have a positive charge.  Electrons have a negative charge.