Class 10SciencePeriodic Classification of ElementsMix Examples - Periodic Classification of Elements
MediumGive an account of the process adopted by Mendeleev for the classification of elements. How did he arrive at Periodic Law?
(N/A) Mendeleev examined the relationship between the atomic masses of elements and their physical and chemical properties.
Among chemical properties,he concentrated on the compounds formed by elements with oxygen and hydrogen (oxides and hydrides).
He selected these two elements because they are very reactive and formed compounds with most elements.
He wrote down the properties of each element on separate cards and grouped together elements with similar properties.
He observed that most of the elements got arranged in the periodic table in the order of increasing atomic masses.
Based on this,he formulated the Periodic Law,which states that the properties of elements are a periodic function of their atomic masses.
Among chemical properties,he concentrated on the compounds formed by elements with oxygen and hydrogen (oxides and hydrides).
He selected these two elements because they are very reactive and formed compounds with most elements.
He wrote down the properties of each element on separate cards and grouped together elements with similar properties.
He observed that most of the elements got arranged in the periodic table in the order of increasing atomic masses.
Based on this,he formulated the Periodic Law,which states that the properties of elements are a periodic function of their atomic masses.
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Similar Questions
Two elements $M$ and $N$ belong to group $I$ and $II$ respectively and are in the same period of the periodic table. How do the following properties of $M$ and $N$ vary:
$(a)$ sizes of their atoms?
$(b)$ their metallic characters?
$(c)$ their valencies in forming oxides?
$(d)$ formulae of their chlorides?
$(a)$ sizes of their atoms?
$(b)$ their metallic characters?
$(c)$ their valencies in forming oxides?
$(d)$ formulae of their chlorides?
Medium
View SolutionWrite the formula of the product formed when the element $A$ (atomic number $19$) combines with the element $B$ (atomic number $17$). Draw its electronic dot structure. What is the nature of the bond formed?
Medium
View SolutionArrange the following elements in the increasing order of their metallic character:
$Mg, Ca, K, Ge, Ga$
$Mg, Ca, K, Ge, Ga$
Medium
View Solution$(a)$ How does electropositivity of elements get affected as we move :
$(i)$ down a group
$(ii)$ across a period?
$(b)$ Which atomic property increases both as we move across a period or down a group?
$(i)$ down a group
$(ii)$ across a period?
$(b)$ Which atomic property increases both as we move across a period or down a group?
Medium
View SolutionThe atomic number of an element is $17$. Predict $(a)$ its valency,$(b)$ whether it is a metal or non-metal,$(c)$ its relative size with respect to other members of its group. Justify your answer in each case.
Medium
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