front 1 Atom | back 1 a tiny particle that is the fundamental building block of all substances and whose properties determine the properties of an element made up only of those atoms. |
front 2 Atomic Mass | back 2 the measure of the mass of an atom, generally the sum of the protons and neutrons; this term is used when referring to a single atom or atoms of a single isotope. |
front 3 Atomic Nucleus | back 3 the positively charged core of an atom, which is composed of positively charged protons and electrically neutral neutrons. |
front 4 Atomic Number | back 4 the number of protons in every atom of an element. |
front 5 Electron | back 5 a tiny part of an atom with a negative electrical charge. |
front 6 Proton | back 6 a positively charged particle found in the nuclei of atoms. |
front 7 Neutron | back 7 a neutral particle with approximately the same mass as a proton, found in nuclei of atoms along with protons. |
front 8 Isotope | back 8 atoms of the same element that differ in the number of neutrons in the nucleus, |