Science

Development Of The Periodic Table

It is approximately 100 elements.

Sub-Atomic Discoveries

The discovery allowed scientists to work out that elements with the same numbers of electrons in their outer shell had similar chemical properties.

The discovery of protons allowed scientists to order the elements in the Periodic Table by their atomic numbers.

The discovery of protons allowed scientists to order the elements in the Periodic Table by their atomic number.

Group 0

It has changed a lot over time as scientists have organised the elements differently.

The first list of elements,Mendeleev's Periodic Table,and the modern Periodic Table have a number of differences in how they list the discovered elements.

Elements in Group 0 are called the noble gases.

Noble gases have the following properties:

Full outer shells,so do not to loose or gain electrons.

Very unreactive (inert)so exist as single atoms as they do not bound to form molecules.

Boiling points that increases down the group.

Group 1 elements and Group 1 properties

Group 1 elements react with oxygen,chlorine,and water,for example:

Lithium+Oxygen->Lithium Oxide

Lithium+Chlorine->Lithium Chloride

Lithium+Water->Lithium Hydroxide+Hydrogen