|
|
 |
Historical Development Of Atomic Structure
Below is a free term papers summary of the paper "Historical Development Of Atomic Structure." If you sign up, you can be reading the rest of this term papers in under two minutes. Registered users should login to view this term paper.
| Term Paper Title | Historical Development Of Atomic Structure |
| # of Words | 1131 |
| # of Pages (250 words per page double spaced) | 4.52 |
Historical Development of Atomic Structure
Historical Development of Atomic Structure
Yazan Fahmawi
Sept. 30, 1995
T3 IBS Chemistry
Ms. Redman
The idea behind the "atom" goes back to the Ancient Greek society, where
scientists believed that all matter was made of smaller, more fundamental
particles called elements. They called these particles atoms, meaning "not
divisible." Then came the chemists and physicists of the 16th and 17th centuries
who discovered various formulae of various salts and water, hence discovering
the idea of a molecule.
Then, in 1766 was born a man named John Dalton born in England. He is known as
the father of atomic theory because he is the one who made it quantitative,
meaning he discovered many masses of various elements and, in relation,
discovered the different proportions which molecules are formed in (i.e. for
every water molecule, one atom of oxygen and two molecules of hydrogen are
needed). He also discovered the noble, or inert gases, and their failure to
react with other substances. In 1869 a Russian chemist, best known for his
development of the periodic law of the properties of the chemical elements
(which states that elements show a regular pattern ("periodicity") when they are
arranged according to their atomic masses), published his first attempt to
classify the known elements. His name was Mendeleyev, and he was a renowned
teacher. Because no good textbook in chemistry was available at the time, he
wrote the two-volume Principles of Chemistry (1868-1870), which later became a
classic. During the writing of this book, Mendeleyev tried to classify the
elements according to their chemical properties. In 1871 he published an
improved version of the periodic table, in which he left gaps for elements that
were not yet known. His chart and theories gained acceptance by the scientific
world when three elements he "predicted"—gallium, germanium, and scandium—were
subsequently discovered In 1856 another important figure in atomic theory was
born: Sir Joseph John Thomson. In 1906, after teaching at the University of
Cambridge and Trinity University in England, he won the Nobel Prize in physics
for his work on the conduction of electricity through gases. He discovered what
an electron is using cathode rays. An electron is the smallest particle in an
atom, whose mass is negligible compared to the rest of the atom, and whose
charge is negative. Though scientists did not know it at the time, electrons
were located in an electr
This is not the end of the termpaper! Register below to see the complete version of this term paper.
| Membership Plans |
Credit Card |
Check |
 |
| 1 month membership |
|
3 month membership
(You Save 50%) |
|
6 month membership
(You Save 67%) |
|
|
