1.1 Atomic Theory

Nucleus

________ is tiny compared to an atom.

Aristotle

________: deduced that all matter was made of 4 elements.

Atoms

________ can be divided into 3 subatomic particles (electron, proton, and neutron)

Planetary model

________, electrons travel in fixed orbits.

Element

________: substance that can not be broken down into simpler substances.

Atom

________: the smallest particle having properties of an element.

Atoms

________ are separated, combined, rearranged in chemical reactions.

atom

the smallest particle having properties of an element

element

substance that cannot be broken down into simpler substances

Aristotle

deduced that all matter was made of 4 elements

ex

fire, air, water, and earth

credited with discovery of

protons and dense nucleus