Definition of Nucleus In chemistry, a nucleus is the positively charged centre of the atom consisting of protons and neutrons. It’s also known as the “atomic nucleus”. History The word “nucleus” comes from the Latin word nucleus, a form of the word nux, which means nut or kernel. The term was coined in 1844 by … Read more
Definition of Average Atomic Mass Average atomic mass considers the isotopic abundance (relative to each other found in the Earth). For example, the most abundant carbon isotope is carbon-12, which has a relative abundance of 98.89%. The atomic masses of carbon-13 and carbon-14 are 13.003 amu and 14.003 amu, respectively. The average atomic mass of … Read more
Definition of Atom An atom is defined as the smallest unit that retains the properties of an element. An atom is composed of atoms and these cannot be made or destroyed. All atoms of the same element are identical and different elements have different types of atoms. Chemical reactions occur when atoms are rearranged. It … Read more