Q2: Lesson 1.2 | Atomic Structure Timeline Flashcards
He proposed that matter was composed of tiny indivisible particles
Democritus
Mixture of science and mysticism
Alchemy
Created the Billiard Ball Model
John Dalton
John Dalton created the ________________ atom model
Billiard Ball Model
He is a British schoolteacher who based his theory on other’s experimental data
John Dalton
TRUE OR FALSE: Elements are composed of small indivisible particles called atoms
True
TRUE OR FALSE: Atoms of the same element are different
False (Atoms of the same element are identical)
TRUE OR FALSE: Atoms of the different elements are different
True
He discovered radioactivity
Henri Becquerel
He discovered electrons
J. J. Thomson
He created the Plum-Pudding Model
J. J. Thomson
An atomic structure where the atom is a uniform solid sphere
Billiard Ball Model
J. J. Thomson created the ____________ atomic model
Plum-Pudding Model
An atomic model where there is a positive sphere with negative electrons dispersed throughout
Plum-Pudding Model
He discovered the nucleus
Ernest Rutherford
Negative particles within the atom
Electrons
Dense, positive charge in the center of the atom
Nucleus
He created the nuclear model
Ernest Rutherford
Ernest Rutherford created the ________ atomic model
Nuclear Model
Atomic model where there is a dense, positive nucleus surrounded by negative electrons
Nuclear Model
TRUE OR FALSE: Electrons can only exist in specific energy states
True
According to him, electrons can only exist in specific energy states
Niels Bohr
He created the Planetary Model
Niels Bohr
Niels Bohr created the ____________ atomic model
Planetary Model
