Periodic Table: Task 2

John Dalton:

-born into a Quaker family at Eaglesfield in Cumberland, England in 6th September 1766 and died in 27th July 1844.
-best known for his pioneering work in the development of modern atomic theory, and his research into colour blindness.
-Theories:
1.The atoms of a given element are different from those of any other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights.
2.All atoms of a given element are identical.
3.Atoms of one element can combine with atoms of other elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.
4.Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process; a chemical reaction simply changes the way atoms are grouped together.
5.Elements are made of tiny particles called atoms.
-used rough and inaccurate instruments but was contented with it, used his head more than his hands.
Source:http://en.wikipedia.org/wiki/John_Dalton

Periodic Table: Task 1

1.Scientists have created all the elements beyond element 92. Find out how they have been made.

Scientists create heavy elements by bombarding two lighter elements that together add up to the mass of the desired new element. One of the elements is stationary and thus called the target. The other, called the projectile, is accelerated in a cyclotron or other type of particle accelerator and effectively shot into the first element. A tiny fraction of the time the two elements "stick" together and form the new element, which then quickly decays.

Source:http://www.scientificamerican.com/article.cfm?id=how-do-scientists-detect