PHYSCI FIRST QTR: HISTORY OF ATOMS (SCIENTISTS)

Empedocles

Everything around you is made of the four natural.

Empedocles

Fire, water, air, and earth.

Democrtius

Everything is made out of tiny matter, which is indestructible.

Democrtius

Atoms are constantly in motion

Democrtius

An infinite number of atoms and kinds that differ in size and shape.

Aristotle

Accepted the theory of Empedocles.

Aristotle

Four core elements could be transformed into one another.

John Dalton

Matter is made of small, indivisible atoms

John Dalton

Atoms can't be subdivided, created, or destroyed.

John Dalton

Atoms of the same element have the same property

John Dalton

Atoms of different elements have different properties.

John Dalton

Atoms of different elements can form compounds.

JJ Thompson

plum-pudding model

JJ Thompson

An atom is electrically neutral and has no charge

JJ Thompson

In an atom, both positive charges and negative charges are equal.

JJ Thompson

Atom is made out of a sphere of positive charges with negatively charged electrons embedded in it.

JJ Thompson

Ernest Rutherford

Nuclear Model

Ernest Rutherford

Atoms are mostly empty space

Ernest Rutherford

Most of the mass is concentrated in the center of atom. This tiny dense positively charged core is called a nucleus.

Ernest Rutherford

Electrons are located outside the nucleus.

Ernest Rutherford

Niels Bohr

Planetary model

Niels Bohr

Electrons orbit the nucleus

The orbits have specific size and energy

Niels Bohr

The energy is related to its size.

Niels Bohr

The lowest energy is found i the smallest orbit

Niels Bohr

Electrons can move between each shell when gaining or losing energy.

Niels Bohr

Erwin Schrondinger

Quantum Mechanical Model

Erwin Schrondinger

Electrons move around the nucleus in a cloud not orbits.

Erwin Schrondinger

Orbital helps us predict the area we can find electrons.

Erwin Schrondinger

The closer position to the nucleus, the higher chance to find electrons.

Erwin Schrondinger