EVERYDAY SCIENCE

Detailed explanation-1: -The atomic mass of an element is given as follows. From the above equation, it is clear that the atomic mass will be increased by one unit by adding one neutron to the nucleus, but its atomic number does not change. Thus, the given statement is false.

Detailed explanation-2: -As the atomic number increases, the atomic mass (or mass number-the number of protons and neutrons) also increases. As the atomic mass increases, it causes an increase in the volume of the nucleus but the nuclear density remains constant.

Detailed explanation-3: -The neutron is slightly heavier than the proton. This increases the mass of nuclei with more neutrons than protons relative to the atomic mass unit scale based on 12C with equal numbers of protons and neutrons.

Detailed explanation-4: -Nuclei are very dense and extremely small. They contain more than 99.9% of the mass of an atom and are ten thousand times smaller than an atom! The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral.