Elements which show the properties of metals as well as non metals are called metalloids

Elements that generally do not shine, neither too hard nor too soft and non conductors of heat and electricity are called non-metals

i) Metalloids are all solid at room temperature.
ii) Metalloids can form alloys with other metals.
iii) The physical properties of metalloids tend to be metallic but their chemical properties tend to be non-metallic

Chemical symbol of an element represents:
i) Name of the element
ii) One atom of the element

The tendency of metals to be hammered into very thin sheets is called malleability

(i) Compounds obtained from living sources like plants, animals etc. are called as organic compounds.
(ii) (ex) Protein, Carbohydrates

(i) Compounds obtained from non living sources like rock, minerals etc. are called as inorganic compounds.
(ii) (ex) Chalk, baking powder

(i) The molecule of a substance that contains two or more atoms of different elements combined together in a definite ratio is called as a compound.
(ii) (ex) CO₂, H₂O

a) Washing Soda: As cleaning agent in soap and softening of hardwater.
b) Table Salt: Essential component of our daily diet, preservative for meat and fish.
c) Slaked Lime: White washing of walls
d) Sugar : Preparation of sweets toffees and fruit juices.

Uses of Compounds
Let us tabulate some compounds and their constituents that we use in our daily lif