Chemistry One-Liners for various competitive examinations

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Chemistry One-Liners for various competitive examinations

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Here are some important Chemistry one-liners for students competing for various exams

 

Watch some of the important Chemistry Bits below.


1- The first ever successful classification of elements was done by Mendeleef.


2- In Mendeleev’s table, the elements are arranged in the increasing order of their atomic weights.


3- Mendeleev predicted three unknown elements  They are eka-boron(Sc), eka-aluminium (Ga) and eka-silicon(Ge).


4- Mendeleef corrected the atomic weights of Be, U etc.


5- Moseley’s Periodic Law: Properties of elements are a periodic function of their atomic number.


6- Modern Periodic Law: Properties of elements are a periodic function of their electronic configuration.


7-  The Long form of periodic table consists of 16 groups and 7 periods.


8- There are only two elements in the first period.


9-  There are eight elements in second and third periods.


10- There are eighteen elements in fourth and fifth periods.


11- There are 32 elements in the sixth period.


12- The Seventh period is incomplete.


13- Based on the differentiating electron, the elements are classified into s, p, d, and f blocks.


14- Each period starts with an alkali metal and ends with an inert gas( except Hydrogen).


15- All s-block elements are soft metals.


16- All d and f-block elements are metals.


17- All types of elements, metals, non-metals, semi-metals and inert gases are present in p-block.


18- s-block elements and p-block elements except inert gases are representative elements.


19- The first reasonable classification of elements was given by Dobereiner.


20- A set of three elements of similar properties arranged in the increasing order of their atomic weights is called a triad.


21- Law of Octaves was given by Newlands.


22- According to the law of Octaves, if the elements are arranged in the increasing order of their atomic weights, every eighth element resembles the first one.


23- All f-block elements are inner transition elements and vice versa.


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