Classification of Elements and Periodicity in Properties

Classification of Elements and Periodicity in Properties Class 11 NEET Chemistry

There are 128 elements know till now and it is difficult to study their properties separately. So in order to make their study easy classification of elements is done.

Classification: It is the grouping of similar elements together and separating them from the elements which are not similar to them.

•     Many attempts have been made by many scientists in order to classify elements

•     When the elements were discovered so many patterns were proposed (approx. 2000 patterns )

•     Initially 31 elements were introduced than the discovery went to 63 then to 114 and now more than it.

•     It is very difficult to memorize properties of so many elements therefore some patterns were proposed to make their study easier.

Dobereiner’s law of triads

• He arranged elements in group of 3 that is known as triads.

•    He proposes different traids depending upon many properties like increasing atomic mass, similar in properties and the atomic mass of the middle element is the arithmetic mean of atomic mass of first and third element.

•     For example:- Consider the elements Li, Na and K

• They have some chemical properties i.e.

1.     - all are metals

2.     - all react with water to form alkalis

3.     - all have valency-1

Limitation- He failed to arrange all known elements in form of triad.

According To Mendeleev periodic law: -

•  Properties of elements are periodic function of their atomic in this there are seven periods and eight groups. Out of 8 groups seven are of normal elements and one of transition elements.

• “He also left gaps in his table for unknown elements”

• He thought that when these elements would be discovered later,then they can be placed in table without disturbing other elements.

MERITS

•     He grouped the elements on the basis of atomic mass.

•     He left gaps for undiscovered elements like Gallium, Scandium germanium. Even he left full group vacant for undiscovered inert gases.

•     He could predict proportions of several elements on basis of their position in periodic table like Ga, Sc etc.

•     He could predict errors in atomic weights of some elements like gold, platinum etc.

ANOMALIES.

•     Position of isotopes could not be explained.

•     wrong order of atomic masses could not be explained for example: - as Argon atomic mass 40 come first and K with low atomic mass) 30) should come later but k should be placed first all to his low.

•     Position of hydrogen could not be explained.

•     Some dissimilar elements are grouped together while some elements are placed in different groups. For example – alkali metals such as Li , Na, K, etc. (group AI) are grouped together with coinage metals such as Cu, Ag, and Au.

•     Lanthanides and actinides are not included in main body.

   
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