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Classification Of Elements & Periodicity in text Properties - Coggle…
Classification Of Elements & Periodicity in text Properties
Dobernier's Law Of Triads
Group Of 3 Elements
Atomic Mass Of 2nd is equal to Average Atomic Mass of 1st & 3rd
Similar Properties and Atomic Mass
Newland's Octaves
8th Element Similar to 1st
Drawbacks
No New Elements
Noble Gases
Lother - Meyer Curve
Drawback - Not Practical
Peaks - Alkali Metals
Troughs - d-block Metals
Mid-Descending Curve - Alkaline Earth Metals
Mid-Ascending Curve - Halogens
Atomic Vol. - Atomic Weight Graph
Mendeleev's Periodic Table
Tabular - 7 rows / 9 coloumns
Similar Properties - Same Group
Left spaces for Undiscovered Elements & predicted their properties
Drawbacks
Isotopes
Hydrogen
Law - Properties Of elements are a periodic function of their atomic mass
Modern Periodic Table
Mosley's Periodic Law - Properties Of elements are a periodic function of their atomic number
Made by - Bohr, Burry, Rang, Werner
Period No - Principal Quantum no. (n)
Parts
d - block (Transition Metals)
f - block (Inner Transition Metals)
s - block (Representative Elements)
p - block (Representative Elements)
2nd Period Exceptional Bhaviour
Small Size
High EN
No d - orbital
78% Metals
Mettaloids - Si, Ge, As, Sb, Te, Po, At
No. of elements in period is 2*(square of shell no.)
Atomic Radius
Covalent Radius
Half of Internuclear distance between atoms in homonuclear atomic molecule
Applies To non-metals
Mettalic Radius
Half the internuclear distance between atoms of mettalic lettuce
Applies to metals
Vanderwall's Radius
Half of the internuclear distance of atoms in closest proximity in solid or liquid
Highly erronuous
Factors