Question

write history of modern peroidic table​

Answer 1

Answer:

History of the periodic table of chemical elements. ... In 1863 English chemist John Newlands divided the then discovered 56 elements into 11 groups, based on characteristics. In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass.

Explanation:

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Answer 2

Answer:

History of modern periodic table.

Explanation:

Earlier attempts to classify elements:

1)Dobeniers triad

2)AEB Chancourtios

3)Newlands octave

4)Lother Meyer's classification

5)Mendeleev's Classification

Modern Law of classification:

English physicist Henry Moseley studied the frequency of x rays produced by bombardment of a strong beam of electrons on metal Targets. He found that the square root of frequency of x-ray (v) is directly proportional to the effective nuclear charge (Z) A plot of √v and Z gave straight line.

Therefore he suggested atomic number instead of atomic weight should be basis of classification.

Periodicity:

The repetition of properties of elements after regular intervals when elements are arranged in order of increasing atomic number.

Cause of periodicity:

The periodic repetition of elements is due to recurrence of similar valence shell electronic configuration after regular intervals.

Long form periodic table:

The long form periodic table is developed by Range, Werner, Bhor, And Bury. this table is also referred to as Bhor's table.