Matching Pairs AtomsOnline version Atoms by Patricia Gallego Galvez 1 Jonh Dalton 2 Periodic Table of Elements 3 Mass number (A) 4 Atomic number (Z) 5 Atomic Shell 6 Atomic nucleus 7 Covalent bond 8 Metalic crystals 9 Protons 10 J. J. Thomson 11 Electrons 12 Isotopes 13 Molecule 14 Metalic bond 15 Ions 16 Ionic bond 17 Molecule properties 18 Niels Bohr 19 Ionic crystals 20 Neutrons 21 Ernest Rutherford 22 Covalent crystals 23 Atom 24 Chemical bond Atoms of the same element that have different numbers of neutrons The sum of the number of neutrons and protons in an atomic nucleus Heavy positively charged particles found within atomic nuclei. A table that classifies elements by their physical and chemical properties; rows are called periods; columns are called groups; An attraction between a positive metal ion and the electrons surrounding it Negatively charged particles, with very small mass, found outside the nucleus The smallest unit of matter that constitutes a chemical element. Formed when one or more electrons are transferred from one metal to non-metal atom Very high melting and boiling points, soluble in water and good electrical conductors in solution or molten An atom's dense central core, containing protons and neutrons. The number of protons in the nucleus of an atom Charged atoms A chemical bond formed when non-metal atoms share electrons Liquids or gases at room temperature. Some can be solid, but they melt at low temperatures. Two or more non-metal atoms held together by covalent bonds From low to high melting and boiling points, insoluble in water and very good electrical conductors Heavy uncharged particles found within atomic nuclei Very high melting and boiling points, insoluble in water and not good electrical conductors The force that holds atoms together A grouping of electrons surrounding the nucleus of an atom
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