PERIODIC TABLE
*An arrangement of elements with similar properties placed together is called
Ans : Periodic Table
*Mendeleev's periodic table was based on
Ans : increasing order of atomic mass
*Moseley's periodic table was based on the
Ans : atomic number of elements
*The modern periodic table is based on
Ans : atomic number
*Modern periodic table contains
Ans : 7 horizontal rows and 18 vertical columns
*The periodic table was discovered by
Ans : Dmitri Ivanovich Mendeleev
*Modern periodic table was discovered by
Ans : Henry Moseley
*Periodic laws were put forward by
Ans : Mendeleev
*Modern periodic laws were put forward by
Ans : Moseley
*The scientist who classified elements based on Atomic Values is
Ans : Lothar Meyer
*The rows are called
Ans : Periods
*Columns are called
Ans : Groups
*The left side of the periodic table denotes
Ans : Metals
*The right side of the periodic table denotes
Ans : Non-metals
ELEMENTS SCIENTISTS
*Hydrogen - Henry Cavendish
*Oxygen - Joseph Priestly
*Selenium - Berzelius
*Thorium - Berzelius
*Calcium - Humphry Davy
*Sodium - Humphry Davy
*Potassium - Humphry Davy
*Boron - Humphry Davy
*Barium - Humphry Davy
*Uranium - Martin Klaproth
*Radium - Madam Curie
*Nitrogen - Daniel Rutherford
*Fluorine - Henri Moissan
*Iodine - Bernard Courtois
*Chlorine - Carl Wilhelm Scheele
*BHC - Michael Faraday
*Methane - Alexander Volta
*Titanium - William Gregor
*Aluminium - Hans Orsted
*Nitrous Oxide - Joseph Priestly
*DDT - Paul Muller
*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
CLASSIFICATION OF GROUPS
*1st group -Alkali metals
*2nd group- Alkaline earth metals
*3-12 group -Transition elements
*13thgroup -Boron family
*14thgroup -Carbon family
*15thgroup - Nitrogen family
*16thgroup - Oxygen family
*17thgroup - Halogen
*18thgroup - Noble gas
*The first artificial element
Ans : Technetium (Z = 43)
*Man made elements are known as
Ans : Transuranics
CHARACTERISTICS OF PERIODIC TABLE
Features Top to bottom Left to right
*Atomic size increases decreases
*Ionization Energy decreases increases
*Electron affinity decreases increases
*Ionization potential decreases increases
CLASSIFICATION OF ELEMENTS
*Metals and non-metals
Ans : Lavoisier
*Triads
Ans : Dobereiner
*Law of octaves
Ans : John Newland
*Based on atomic wei
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