what is periodic table ?
who is mandeleef ?
( at least 200 words )
Answers
Many scientists came to establish their own periodic table but each were discarded after that one scientist came named Lother Mayer his conclusion about his effort to make periodic table give rise to Mendeleev
Mendeleev's periodic table---->
the physical and the chemical properties of elements are the periodic function of their atomic weight.
characteristics of Mendeleev's periodic table.
1. based on atomic weight
2.63 elements were known,nobel gases not discovered
3.elements belonging to same group exhibit similar properties
4.horizontal rows called period and vertical column is Called group
Merits--)
1. Prediction of new element.......left gaps in his table for example Sc,Ga,Ge,T
2. He is the first to give tabular form of periodic table.
3. Correction of doubtful atomic weight like that of U,Be,In,Au,Pt
4. Nobel gases can be placed separately in new group.
Demerits----)
1.Position of hydrogen....can be ignored bcoz it is still a drawback.
2.Position of isotopes....as it is according to atomic weight isotopes say for example of hydrogen should be placed separately but it is not so.
3. Anomalous pairs of elements-----) there were some elements which does follow increasing order of atomic weights
examples ----Ar and K , Co and Ni , Th and Pa
4. like elements were in different groups say for example platinum and gold.
5. unlike were placed together in same group say for example Cu,Ag and Au....were together
Explanation:
The periodic table, also known as the periodic table of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties. The structure of the table shows periodic trends. The seven rows of the table, called periods, generally have metals on the left and nonmetals on the right.
The columns, called groups, contain elements with similar chemical behaviours. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases. Also displayed are four simple rectangular areas or blocks associated with the filling of different atomic orbitals.
The elements from atomic numbers 1 (hydrogen) through 118 (oganesson) have all been discovered or synthesized, completing seven full rows of the periodic table.[1][2] The first 94 elements, hydrogen through plutonium, all occur naturally, though some are found only in trace amounts and a few were discovered in nature only after having first been synthesized.[n 1] Elements 95 to 118 have only been synthesized in laboratories, nuclear reactors, or nuclear explosions.[3] The synthesis of elements having higher atomic numbers is currently being pursued: these elements would begin an eighth row, and theoretical work has been done to suggest possible candidates for this extension. Numerous synthetic radioisotopes of naturally occurring elements have also been produced in laboratories.
The organization of the periodic table can be used to derive relationships between the various element properties, and also to predict chemical properties and behaviours of undiscovered or newly synthesized elements. Russian chemist Dmitri Mendeleev published the first recognizable periodic table in 1869, developed mainly to illustrate periodic trends of the then-known elements. He also predicted some properties of unidentified elements that were expected to fill gaps within the table. Most of his forecasts proved to be correct. Mendeleev's idea has been slowly expanded and refined with the discovery or synthesis of further new elements and the development of new theoretical models to explain chemical behaviour. The modern periodic table now provides a useful framework for analyzing chemical reactions, and continues to be widely used in chemistry, nuclear physics and other sciences. Some discussion remains ongoing regarding the placement and categorisation of specific elements, the future extension and limits of the table, and whether there is an optimal form of the table.