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21 Cards in this Set

  • Front
  • Back

Ionization

Horizontally, increases


Verticay, decreases

Electronegativity

Horizontally, increases


Down, decreases

Atomic Radii

Horizontal,decreases


Vertical, increases

Group

Vertical on periodic table

Period

Horizontal

Democritus

Greek philosopher who was among the first to suggest the existence of atoms

John Dalton

English chemist and schoolteacher who formulated a theory to describe the structure and chemical reactivity of matter in terms of atoms

Charge and weight of protons?

Charge +


Weight 1 amu

Charge and weight of neutrons?

Charge none


Weight 1 amu


Charge and weight of electrons?

Charge -


Weight 1 amu

Mass number

neutrons+protons

Atomic number

Number of protons in nucleus

Isotope

Atoms that have the same number of protons but different numbers of neutrons

Ion

An atom woth a net charge due to the loss or gain of an electron

JJ Thompson

Found that atoms sometimes eject a far smaller negative particle which is called and electron

Rutherford

Detailed model with a central nucleus, positive charge in nucleus

Bohr

Electrons were in orbits, each orbit can only contain a set number of electrons

Moseley

Rearranged the elements in order of increasing atomic number

Dobereiner

Classified elements into groups of three, called triads

Seaborg

The actinide series

Mendeleev

Organize elements in order of increasing atomic mass