SCIENCE

Electron Configuration

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p

he said that atoms cannot be broken into smaller pieces. In any element, all the atoms are exactly alike

Dalton's Solid Sphere Model (1803-1805)

Greek Philosopher in 400 BC. he named the smallest piece of matter "atomos" meaning "not to be cut". he said that atoms were small, hard particles that were all made of the same material but were different shapes and sizes.

Democritus' Atomic Theory

he discovered proton and nucleus

Ernest Rutherford

in 1911, he and his colleagues performed a series of experiments involving alpha particles directed at thin gold foil; the result of these experiments formed the basis of his Nuclear Model of an Atom

Ernest Rutherford's Nuclear Model of an Atom

he discovered neutron

James Chadwick

he discovered electron

Joseph John Thompson

he said negative electrons stuck inside and on the surface of a positive pudding

Joseph John Thompson's Plum Pudding Model

in 1913, he described a model of the hydrogen atom. his model is the same as Rutherford's model in terms of the presence of a dense, positively changed nucleus surrounded by space where electrons move about.

Niels Bohr's Model of an Atom (Planetary Model)

the atom has a very small, dense region that contains all of it's positive charge and all of it's mass. This region is called the

Nucleus

depicts the electron distribution and electron spin within orbitals of an atom

Orbital Diagram

this model is established the concept of fixed electrons energy in the atom

Planetary model of an atom by Bohr

is the basic unit of matter. is also the smallest particle of an element that retains al the characteristics of the element

atom

two or more elements combined

compound

negatively charged particle

electron

electrically neutral (has no change)

neutron

positively charge particle

proton

are in the center of the atom called nucleus

protons and neutrons