Chemistry Unit 2

Greek Philosopher

Created theory that everything is made of tiny atoms

Created the word Atomos, it means "undivided" in Greek

Believed Atoms are indestructible with empty space around them

• Ernest Rutherford

• Democritus

• John Dalton

• J.J Thompson

English Chemist who experienced with gases

Created the Modern theory of Atoms through his experiments.

Theorized that atoms could bond to form

His atomic model is seen as a solid sphere shaped like a “billiard ball.”

• John Dalton

• J.J Thompson

• Albert Einstein

• Niels Bohr

All matter is made up of atoms. Atoms are the smallest fundamental unit of matter.

• True

• False

Atoms of different elements are different in size, shape & mass.

• True

• False

All elements consists of Atoms which are indivisible & indestructible

• True

• False

All atoms of the same element are identical in size, shape & mass.

• True

• False

Atoms of different elements can react and bond into chemical compounds.

• True

• False

English chemist who experienced with Cathode Rays Tubes

Discovered negatively charged particles and called them electrons

Thomson knew that atoms are neutral, so he hypothesized

that the negative

electrons were swirling around a positively charged region.

Cathode Ray Tubes:

The beam is attracted to the positively charged plate.

This means that the particles are negatively charged.

• J.J Thompson

• John Dalton

• Niels Bohr

• Ernest Rutherford

Danish Scientist who modified Rutherford's model to explain the behaviors of Electrons

Theorized that the electrons orbited nucleus through specific paths

The ____ model contains paths for electrons called energy levels

The nucleus is in the center of the atom.

• Niels Bohr

• James Chadwick

• J.J Thompson

• Erwin Schrodinger

English chemist made famous through the Gold Foil Experiment

Shot a beam of small, alpha particle into a thin sheet of gold foil

_____ expects the alpha particle to go straight, instead some of the alpha particles deflected.

______ theorized that the nucleus was positive

• Ernest Rutherford

• James Chadwick

• Erwin Schrodinger

• John Dalton