Chapter 3:Atoms-the building blocks of matter

democritus

said “matter is made of tiny particles that are indivisible“(atomos)

Aristotle

he was the father of biology and said ”matter is continuous”

Lavoisier

“Father of chemistry“ created“the law of conservation of mass“

law of conservation of mass

the sum of the mass of the reactants must equal the sum of the mass of the product

proust

“law of definite proportions“

john dalton

“father of atomic theory“

“law of multiple proportions“-john dalton

1. matter is made of tiny particles called atoms

2. all atoms of an element are identical

3. atoms of different elements are different

4. elements combine in small whole number ratios

Gay Lussac

2 containers of H to use 1 container of O

Avogadro

equal volumes of gasses at the same temp and pressure will contain the same number of protons

electrons

negatively charged particles responsible for the behavior of the element

protons

Positively charged atoms responsible for determining what the element is

neutron

no charge responsible for adding weight to the atom

JJ thomson

worked with electricity, discovered electrons

Cathode Ray tube

milleken

discovered the size of the charge on an electron “oil drop experiment“

chemical reaction

when one or more substances change into one or more new substances