Jonh Dalton
Niels Bohr
Chemical bond
Covalent crystals
Metalic crystals
Metalic bond
Atom
Atomic number (Z)
Periodic Table of Elements
Atomic nucleus
Ionic bond
J. J. Thomson
Protons
Isotopes
Ions
Neutrons
Covalent bond
Electrons
Molecule
Ernest Rutherford
Ionic crystals
Molecule properties
Atomic Shell
Mass number (A)
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
Negatively charged particles, with very small mass, found outside the nucleus
Heavy uncharged particles found within atomic nuclei
The force that holds atoms together
From low to high melting and boiling points, insoluble in water and very good electrical conductors
A grouping of electrons surrounding the nucleus of an atom
The sum of the number of neutrons and protons in an atomic nucleus
Very high melting and boiling points, insoluble in water and not good electrical conductors
Liquids or gases at room temperature. Some can be solid, but they melt at low temperatures.
An atom's dense central core, containing protons and neutrons.
The smallest unit of matter that constitutes a chemical element.
Atoms of the same element that have different numbers of neutrons
Formed when one or more electrons are transferred from one metal to non-metal atom
Two or more non-metal atoms held together by covalent bonds
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
Charged atoms
A chemical bond formed when non-metal atoms share electrons
