EVERYDAY SCIENCE

Detailed explanation-1: -The nucleus contains the majority of an atom’s mass because protons and neutrons are much heavier than electrons, whereas electrons occupy almost all of an atom’s volume. The diameter of an atom is on the order of 10−10 m, whereas the diameter of the nucleus is roughly 10−15 m-about 100, 000 times smaller.

Detailed explanation-2: -Atomic nuclei consist of electrically positive protons and electrically neutral neutrons. These are held together by the strongest known fundamental force, called the strong force. The nucleus makes up much less than . 01% of the volume of the atom, but typically contains more than 99.9% of the mass of the atom.

Detailed explanation-3: -Every atom contains a very small, dense, central core called the nucleus. Apart from hydrogen, the nucleus of every other atom is made up of particles called protons and neutrons. The nucleus is surrounded by mostly empty space, except for very tiny particles called electrons that orbit the nucleus.

Detailed explanation-4: -The majority of the mass of the atom is found in the nucleus, which is made up of protons and neutrons. The part of the atom with the smallest mass is the electron.

Detailed explanation-5: -By definition, the mass of the carbon-12 nucleus is 12u, where u is the atomic mass unit (amu), equal to 1.66 x 10^-27 kg. The mass of an isolated proton has been measured to be 1.0073u and that of a neutron is 1.0087u (about 0.14% larger).