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.
Atoms are made up of three smaller subatomic particles: protons, neutrons, and electrons. Nucleus: the tiny, dense, positively charged center of an atom. â¢protons and neutrons are in the nucleus. â¢makes up over 99.9% of an atomâs mass. â¢if an oxygen atom was as big as a stadium, its nucleus would be the size of a grape.