Famous Scientists

कक्षा 10  विज्ञान  के 10  वैज्ञानिक के योगदान  

Contribution of Scientists  class 10

Johann Wolfgang Dobereiner

Birth – Dec.13,1780 Death – March 24,1849 Country-  Germany

 Dobereiner was a chemist.

Johann Wolfgang Dobereiner

 He made some groups with three elements. He called these groups ‘traids’.  He arranged three elements in the increasing order of atomic masses.

John A. R. Newlands

Born – Nov. 26,1837 Died – July 29, 1898 Country - London(England)

He was an English chemist.

John A. R. Newlands

· He arranged elements in the order of increasing atomic masses.. · He compared it with the octaves of music and he gave the ‘law of octaves’.

 D.I. Mendeleev

Born – Feb. 8, 1834 Died – Feb 2, 1907 Country – Tobolsk, Western Siberia (Russia)

His contribution was appreciated.

 D.I. Mendeleev

·He propounded a periodic law – ‘The properties of elements are the periodic function of their atomic masses.’

  H.G.J. Moesley

Born -Nov. 23,1887 Died – Aug. 10 1915 Country - England

He was an English physicist.

  H.G.J. Moesley

 Modern Periodic law- Properties of elements are a periodic function of their atomic number.