Monday, March 2, 2020
*Most abundant element on earth's crust - Oxygen
*Most abundant metal in earth's crust - Aluminium
*Most abundant metalloid in earth's crust - Silicon
*Most abundant element in atmosphere - Nitrogen
*Most abundant element in the universe - Hydrogen
*Most abundant element in human body - Oxygen
*Most abundant gas in atmosphere - Nitrogen
*Most abundant element in sea water - Chlorine
*Most abundant element in moon's surface - Titanium
*Most abundant metal present in human body and bones - Calcium
*Most abundant metal compound in bones - Calcium phosphate
*Most abundant compound on earth's surface - Water (H2O)
*Most abundant compound in sea water - Sodium Chloride
*Second most abundant compound in sea water - Magnesium Chloride
*Most chemically reactive element - Fluorine
*Second most chemically reactive element - Chlorine
*The lightest and simplest element - Hydrogen
*The lightest metal - Lithium
*The rarest element in the earth - Astatine
*The heaviest element - Osmium
*The heaviest gaseous element - Radon
*First man made element - Technetium
*Most stable element - Lead
*The periodic table is divided into 4 main blocks
*S block - elements of group 1 and 2
*P block - elements of group 13 to 18
*D block - elements of group 3 to 12
*F block - Lanthanides and Actinides
*The shortest period of the periodic table
Ans : First period
*The longest period of the periodic table
Ans : Sixth period
*Elements with atomic number 57-71 are known as
Ans : Lanthanides (rare earths)
*Elements with atomic number 89-103 are known as
Ans : Actinides (radio active rare earths)
*Total number of elements in periodic table
Ans : 118
*The number of naturally occurring elements
Ans : 92
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