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Atoms and the Periodic Table.

We can classify (arrange) elements in different ways:-

•naturally occurring/made by scientists

•solid/liquid/gas

•metal/non-metal

The Periodic Table of the Elements. The Periodic Table lists the chemical elements in increasing atomic number. The Periodic Table arranges elements with similar chemical properties in groups (vertical columns). All the elements in a group have similar chemical properties as they have the same number of outer electrons.

The Periodic Table of the elements is a useful way of classifying the elements. A vertical column of elements in the periodic table is called a group. The elements in the same group of the periodic table have similar chemical properties. The noble gases are a group of very unreactive elements.

Groups of elements have names: –

Group 1 -

Between groups 2 and 3 -

Group 7 - Group 0 -

the alkali metals

the transition metals

the halogens the noble gases

Every element is made up of very small particles called atoms.

Atoms of different elements have a different number called the atomic number.

Atoms have a very small, positively charged nucleus, with negatively charged electrons outside the nucleus in energy levels.