Question

define elements and compounds and explain them

Answer 1

Elements : It is a substance which cannot be split into two or more simpler substances by using chemical methods of applying heat ,light or electric energy.
Compounds : it is a substance which is made up of two or more elements chemically combined in a fixed proportion by mass.

Answer 2

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ELEMENTS -: The pure substance which is made up of one kind of atoms only is called elements.Nearly there are 118 elements.

Types of elements based on physical state -

(i) Solid elements - The elements which are solid at room temperature. e.g. Gold , sodium etc.

(ii) Liquid elements - The elements which are liquid at room temperature. e.g. mercury , bromine etc.

(iii) Gaseous elements - Only eleven elements exist in gaseous state at room temp. , Hydrogen , oxygen , nitrogen , flourine , chlorine , helium , neon , argon , krypton , xenon and radon.

Types of elements based on characteristics -

(i) Metals

(ii) Non-metals

(iii) Metalloids

COMPOUNDS -: A pure substance containing two or more elements which are combined together in a fixed proportion by mass is called compounds. e.g. H2O . In it , two atom of hydrogen and one atom of oxygen are present in the ration of 2:16 or 1:8 by mass.

Types of compound -

(i) Organic compounds

(ii) Inorganic compounds