what is modern periodic law? describe long form of the peruodic table. why is the long form of the periodic table more useful than mendeleeffs periodic table.
Answers
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PERIODIC LAW: The chemical and physical properties of an element is dependent on the atomic number.
SHORT-FORM PERIODIC TABLE: it is invented by Mendeleev on the basis of atomic weight .
LIMITATIONS:
Mendeleev periodic table is against to the periodic law so his periodic table is failed.
Mostely invented long form periodic table it is invented on the basis of atomic number.
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here is the answer
(1)what is modern periodic law?
Answer:
noun Chemistry. the law that the properties of the elements are periodic functions of their atomic numbers. Also called Mendeleev's law. (originally) the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights.
(2)describe long form of the peruodic table?
Ans:
Long Form of Periodic Table. The long form of the periodic table is based upon the electronic configuration of the elements. It is the present form or the modern periodic table of elements. The modern periodic table of elements consists of 18 vertical columns and 7 horizontal rows.
(3)why is the long form of the periodic table more useful than mendeleeffs periodic table.?
Ans:
Long form periodic table is regarded as better than the Mendeleev’s table due to the following reasons:
Long form periodic table
1. All elements have been arranged in the increasing order of atomic numbers.
2. The position of hydrogen has been justified.
3. It takes into consideration the filling of the electrons in s, p, d and f subshell.
4. The table has been divided into four blocks i.e. s, p, d and f block.
5. Groups are not further sub-divided into subgroups.
6. This is simple and easy to reproduce.
Mendeleev's
1. Elements have been arranged in the increasing order of atomic masses.
2. There is no justification for the position of hydrogen.
3. It takes into consideration only the atomic numbers of the element.
4. There are no blocks in the table.
5. There are sub-groups (A and B) in each group.
6. This is quite difficult to reproduce.
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