Question

A tiny but very dense positively charged portion of the atom that holds most of the atomic masa

Answer 1

is the nucleus. The nucleus is made up of protons and neutrons, and it is surrounded by a cloud of negatively charged electrons. The protons carry a positive charge and are located in the center of the nucleus, while the neutral neutrons are also found in the nucleus but do not carry any charge. The nucleus is held together by strong nuclear forces, which overcome the repulsive forces between the positively charged protons.