atom - A chemical element in its smallest form, made up of protons and neutrons within the nucleus and electrons circling the nucleus., element - A species of atoms having the same number of protons in their atomic nuclei and hence the same atomic number. Chemical elements constitute all of the ordinary matter in the universe; 118 elements have been identified and are organized by their various chemical properties in the periodic table of the elements., molecule - A number of atoms that are chemically bonded together and collectively electrically neutral., compound - A substance that is made up of two or more chemically bonded elements., periodic table - A tabular arrangement of the chemical elements organized by their atomic number, electron configuration, and other chemical properties, whose adopted structure shows periodic trends and is used by chemists to derive relationships between various elements as well as predict the properties and behaviors of undiscovered or newly synthesized elements. The first periodic table of the elements was published by Russian chemist Dmitri Mendeleev in 1869., particle - In chemistry, a particle is a general term for any fundamental, small portion of matter, ranging from subatomic particles like protons and electrons to entire atoms and molecules. This broad definition allows it to describe the basic building blocks of all substances and their interactions, which are studied at a microscopic level to understand macroscopic properties., proton - A subatomic particle with a positive electric charge that is found in the nucleus of an atom., neutron - A type of subatomic particle that is electrically neutral, having no net charge., electron - A type of subatomic particle with a net charge that is negative., nucleus - The centre of an atom, made up of neutrons and protons and possessing a net positive electric charge., density - An intensive property of a substance defined as mass per unit volume and expressed by the equation d = m/V., atomic number - The number of protons found in the nucleus of an atom of a given chemical element. It is identical to the charge number of the nucleus and is used in the periodic table to uniquely identify each chemical element., atomic mass number - The total number of protons and neutrons (together known as nucleons) within the nucleus of an atom. It determines the atomic mass of the atom. Mass number varies between different isotopes of the same chemical element, and is often included either after the element's name (as in carbon-12) or as a superscript to the left of the element's symbol (as in 12C) to identify a specific isotope.,

Chemistry Basics

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