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ALL MIXED UP

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by

Lianna Taing

on 22 March 2016

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Transcript of ALL MIXED UP

1835
1870
1940
1800
1905
JOHN DALTON (1766 - 1844)
The Theory of Atomic Compositions
OR
Dalton's Atomic Theory (1809)
developed laws of how gases interact and perform
law of conservation of mass - total mass in a chemical reaction remains constant
law of definite proportions - when a compound is broken down into its raw elements, the masses of the elements will always have the same proportions, despite of the original substance or the quantity
GEORGE J. STONEY (1826 - 1911)
ALL MIXED UP:
TIMELINE OF THE DEVELOPMENT OF THE ATOMIC STRUCTURE
B O R O N
How many protons, neutrons and electrons does
Boron has 5 protons, 6 neutrons and 5 electrons



Boron is used for



cleaning products
glass
pyrotechnic flares
rocket fuel igniters
allotropic
dark brown to black powder
OR
black to silver-grey metal-like substance
melting point - 2077°C
boiling point - 4000°C
crystalline form is very hard, glossy and brittle

Physical properties of Boron









chemicals properties of Boron
powder oxidizes slowly in air at room temperature
powder at high temperatures, ignites spontaneously and forms an oxide.
crystalline form is oxidized at a very slow pace, even at higher temperatures



Boron have?












Benefits of my model design
shows the amount of electrons, protons and neutrons
the particles of the atom are colour coded
sturdy
Limitations of my model design
it does not replicate the movement of an atom
it does not show all of the atoms in the centre
proposed that electricity was made of negative particles (1879)

called them electrons

calculated the magnitude of the atom using the kinetic theory of gas.
Joseph J. Thomson (1856–1940)
In 1897 discovered the electron by doing experiments to study the electric discharge in a Crookes tube
In 1904, presented a model of the atom with the centre being a sphere of positive matter and the electrons are positioned by electrostatic forces.
proposed another model of the atom which was a plum pudding
model failed to pin point the positive charges in the atom as particles
ERNEST RUTHERFORD
(1871 - 1937)
presented the Rutherford atomic model/ nuclear atom/ planetary model of the atom (1911)

model - in the center is a nucleus, a small, dense, positively charged nucleus and around it are the electrons, circulating at a distance
NIELS BOHR (1885–1962)
In 1913, proposed his model of the atom which explained how electrons can have stable orbits around the nucleus
theory - electrons moving on a curved path and transmits electromagnetic radiation therefore the electrons would lose energy and spiral into the nucleus
electrons move in orbits of fixed size and energy
radiation occurs when the electron jumps from one orbit to another
BIBLIOGRAPHY
Encyclopedia
Encyclopædia Britannica, Inc. (2016), Bohr Atomic Model, sited on 24th of February,
http://abyss.uoregon.edu/~js/glossary/bohr_atom.html

Encyclopædia Britannica, Inc. (2016), Rutherford atoic model | Britannica.com, sited on the 24th of February, http://www.britannica.com/science/Rutherford-atomic-model

Encyclopædia Britannica, Inc. (2016), George Johnstone Stoney | Irish physicist | Briticanna.com, sited on the 24th of February, http://www.britannica.com/biography/George-Johnstone-Stoney

WEBSITES
Royal Society of Chemistry (2016), Boron - Element information, properties and uses | Periodic Table, sited on 24th of February, http://www.rsc.org/periodic-table/element/5/boron

Siteseen Ltd (2015), Boron Properties, sited on 24th of February, http://www.elementalmatter.info/boron-properties.htm

ABCTE (2007), Development of the Atom Theory, sited on the 24th of February, http://www.abcte.org/files/previews/chemistry/s1_p5.html

UNIVERSE TODAY (2016), What is John Dalton's Atom Model? - Universe Today, sited on 24th of February, http://www.universetoday.com/38169/john-daltons-atomic-model/




By: Lianna Taing 9A

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