Storyline Part 2

Ernest Rutherford

________- describes the nucleus as dense (most mass) and that the e- belongs outside the nucleus.

John Dalton

________- hypothesized atoms were made of differing masses.

Neil Bohr

________- modernized the atom by placing e- in orbitals (paths) around the nucleus.

Lewis structure

________- tells the number of valence e /- represented by a dot.

Ions

________- another name for atoms once bonding occurs.

Alpha

________- when 2 protons and 2 neutrons bond together are emitted from the nucleus.

Democritus

________- 1st to say atoms existed.

Beta

________- too many neutrons converts into protons and electrons.

Radioactive decay

________- reaction only affecting the nucleus of an atom.

Isotopes

________- atoms of an element with a different n.

JJ Thompson

________- discovered the electron.

Gamma

________- occurs when ________ rays are emitted occurs immeadiatly following other decays.

Half life

________- time required for half the atoms of a radioactive nuclide to decay.

Democritus

1st to say atoms existed

John Dalton

hypothesized atoms were made of differing masses

J.J Thompson

discovered the electron

Lewis structure

tells the number of valence e-/ represented by a dot

Radioactive decay

reaction only affecting the nucleus of an atom

Alpha

when 2 protons and 2 neutrons bond together are emitted from the nucleus

Beta

too many neutrons converts into protons and electrons

Gamma

occurs when gamma rays are emitted occurs immeadiatly following other decays

Half life

time required for half the atoms of a radioactive nuclide to decay

Isotopes

atoms of an element with a different n

mol

Si unit for the amount of substance

molar mass

the mass of one mole of a pure substance

Ions

another name for atoms once bonding occurs

Cations +

lose electrons

Anions

gain electrons

Parent nuclide

heaviest of the series