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PERIODIC TABLE MOST ASKED QUESTION IN RRB EXAMS



*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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