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