Atomic Structure

Front 1

neutron

Back 1

zero charged particle with a mass equal to a proton

Front 2

Law of Multiple Proportions

Back 2

when one element can combine with another to form more than one compound, the mass ratios of the elements in the compounds are simple whole-number ratios of each other

Front 3

nucleus

Back 3

dense center of an atom that contains protons and neutrons

Front 4

What is the discontinous theory and who created it?

Back 4

-Democritus
-stated all matter is made up of tiny particles, called atoms,which could not be broken down into smaller particles

Front 5

Law of Conservation of Matter

Back 5

-Lavoisier
-In a chemical reaction the mass is not gained or lost

Front 6

Atomic Theory of Matter

Back 6

-Dalton
1. each element is composed of tiny indivisible particles called atoms
2. atoms of the same element are identical, but they differ from those of any other element
3. atoms are neither created nor destroyed
4. a given compound always has the same relative numbers and kinds of atoms

Front 7

Law of Constant Composition

Back 7

-Proust
-A given compound always contains the same elements in the same proportions by mass

Front 8

mass number

Back 8

equals the sum of protons and neutrons contained in the nucleus

Front 9

isotopes

Back 9

atoms of the same element that have different numbers of neutrons
(all have the same number of protons)

Front 10

cation

Back 10

a positive ion

Front 11

proton

Back 11

postively charged particle with a mass 1836 times that of an electron

Front 12

Law of Definite Proportions

Back 12

-Dalton
-when two pure substances react to form a compound, they do so in a definite proportion by mass

Front 13

atomic number

Back 13

equals number of protons

Front 14

What is the continuous theory and who created it?

Back 14

-Aristotle
-a smaple of matter could be divided and subdivided into smaller and smaller parts indefinitly

Front 15

electron

Back 15

negativly charged particle with very little mass

Front 16

amu

Back 16

one atomic unit

Front 17

Anion

Back 17

a negative ion