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Democritus
Early Greek philosopher who proposed that matter is made of indivisible atoms.
John Dalton
Scientist who introduced a modern theory of the atom in the early 1800s.
J.J Thomson
Scientist who first detected the electron.
Ernest Rutherford
Scientist who first proposed the existence of a nucleus in the atom.
Electron
Subatomic particle discovered by J.J. Thomson, carrying a negative charge.
Plum Pudding Model
Thomson's vision of the atom, depicting a positive cloud with electrons dispersed throughout.
Rutherford's Experiment
Involved alpha particles directed at gold foil, some particles were deflected or rebounded.
Dalton's Atomic Theory
elements are made of tiny, indestructable parts called atoms
all atoms of each type of elements have the same mass
atoms combine in simple, whole number ratios to form compounds
What did Rutherford's Atomic Model look like?
Depicted electrons orbiting a dense nucleus.
Protons
Positively charged particles found in the nucleus of an atom.
Neutrons
Neutral particles found in the nucleus of an atom.
Electron
Negatively charged particle that interacts with protons and other electrons.
Charge Neutral Atom
Contains an equal number of protons and electrons.
Atomic Number
Refers to the number of protons in an atom.
Element Definition
Defined by the number of protons it contains.
Nucleus has which particles?
Contains protons and neutrons.
Mass Number
Sum of protons and neutrons in an atom.
Dmitri Mendeleev
Scientist who developed the Periodic Table.
Periodic Table Categories
Metals (left), Metalloids (zig-zag line), Non-metals (right).
Metalloids
Elements with mixed properties, including Boron, Silicon, Germanium, Arsenic, Antimony, Tellurium, Polonium, and Astatine.
Metals tend to form what kind of ion?
Tend to form positive ions by losing electrons.
Non-metals tend to form which kind of ion?
Tend to form negative ions by gaining electrons.
Metalloids
Used as semiconductors due to their mixed properties.
Characteristics of Metals
Good conductors, malleable, ductile, shiny, tend to lose electrons in chemical reactions.
Characteristics of Non-metals
Poor conductors, tend to gain electrons in chemical reactions.
Main Group Elements are found in which columns?
1, 2, 13- 18 of the Periodic Table.
Transition Metals, which columns?
3-12 of the Periodic Table.
Family Groups of columns 1, 2, 17, 18
Alkali metals (column 1), Alkaline earth metals (column 2), Halogens (column 17), Noble gases (column 18).
Pure Diatomic Molecules
Elements like Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, and Iodine that exist as pairs of atoms.
Ions
General term for elements that gain or lose electrons.
Cation
Positively charged ion.
Anion
Negatively charged ion.
Isotopes
Elements with a varying number of neutrons