Elements & Periodic table

Elements

• A substance which cannot be broken down into simpler substances by any chemical method.


• 106 elements in the periodic table

Periodic Table

• Elements are arranged according to their proton number (atomic number).


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  Every element is represented by a chemical symbol that consists either one capitalized letter ( e.g. Carbon -- C) or two letters with the first letter captilized (e.g. Helium -- He)


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  Elements are classified into metals & non-metals.


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  Elements are arranged in Group and Peiod

Group

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  Group-- the vertical column of elements of the Periodic Table.


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  Elements in the same group have similair chemical properties.


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  There are eight groups numbered Group I, II, III, IV, V, VI, VII, 0.

Period

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  Period -- the horizomtal row of elements of the Periodic Table.


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  Across a period from left to right, elements change from metallic to non-metallic


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  Example of elements found in each period number : Period Number 1--Hydrogen to Helium, Period Number 2-- Lithium to Neon, Period Number 3--Sodium to Argon, Period Number 4--Potassium to Krypton, Period Number 5--Rubidium to Xenon and Period Number 6-- Caesium to Radum.

Source: My brain and Sci notes.