COMPOUNDS , ITS DEFINATION ,CHARACTERISTICS , TYPES AND EXAMPLES
COMPOUNDS DEFINATION CHARACTERISTICS IMPORTANCE TYPES IONIC COVALENT METALLIC EXAMPLES
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ELEMENTS , ITS PROPERTIES, EXAMPLES FOR BASIC LEVEL AND FOR 9TH BOTH FOR FEDERAL AND PUNJAB
A substance that cannot be converted into other simpler substance is called elements. There are about 100 elements , each with its own type of atom. Everything in the universe contains the atoms of at least one or more elements . The periodic table lists all the known elements , grouping together those with similar properties. PROPERTIES OF ELEMENTS Each element has its own " characteristic properties" characteristics properties may include: physical properties boiing point melting point density chemical properties radioactivity inflamability EXAMPLES OF ELEMENTS H - Hydrogen . He - Helium. Li - Lithium . Be - Beryllium. B - Boron . C - Carbon. N - Nitrogen. O - Oxygen A component is a single material that can not be divided into various types of substances. Carbon, oxygen, hydrogen, gold, silver and iron are examples of elements. Every element consists of just one atom form.
What is Chemistry and it's Branches:
CHEMISTRY AND IT'S BRANCHES All notes , short Q's , Mcqs and long qs for matric are available