CHEM 1311 Chapter 2 Questions With Complete Solutions

Atoms correct answer: the basic building blocks of all matter. The smallest unit of an element that can combine with other elements. Subatomic Particles correct answer: The smaller particles that make up atoms - protons, neutrons and electrons. cathode rays correct answer: streams of electrons that are produced when a high voltage is applied to electrodes in an evacuated tube Radioactivity correct answer: The spontaneous emission of radiation by an unstable atomic nucleus Nuclear Model correct answer: Model of the atom with a nucleus containing protons and neutrons and with electrons in the space outside the nucleus. Nucleus is positively charged. Proton correct answer: A subatomic particle that has a positive charge and that is found in the nucleus of an atom Neutron correct answer: A subatomic particle that has no charge and that is found in the nucleus of an atom Electron correct answer: A subatomic particle that has a negative charge Electronic Charge correct answer: The negative charge carried by an electron; it has a magnitude of 1.602 x 10^-19 C atomic mass unit (amu) correct answer: Expresses the mass of an atom Angstroms correct answer: Used to measure dimensions of an atom Atomic Number correct answer: the number of protons in the nucleus of an atom Mass Number correct answer: the total number of protons and neutrons in the nucleus of an atom Isotope correct answer: each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element. Atomic Weight correct answer: Average of the