Inventors

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Isaac Newton Isaac Newton Sir Isaac Newton was a famous physicist, mathematician and astronomer. He was born in a small village near Cambridge in 1642. His father died before Isaac’s birth. His first inventions were a sundial and a clepsydra . Newton made them when he was a child. People say the sundial is still in the house, where Isaac Newton was born.

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Isaac was a student at the University of Cambridge. Newton studied mathematics there. During those years Isaac Newton made such discoveries as the law of gravitation, decomposition of light and the method of fluxions. Later he became a professor of mathematics and optics. Isaac Newton died at 85, in 1727.

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Dmitri Mendeleyev Dmitri Ivanovich Mendeleyev was born on February 8, 1834, in the Siberian town of Tobolsk in Russia . After receiving an education in science in Russia and Germany, he became a professor and conducted research in chemistry . The Russian chemist Dmitry Mendeleyev is regarded as the father of the periodic table of chemical elements.

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Mendeleyev is best known for his discovery of the periodic law , which he introduced in 1869 , and for his formulation of the periodic table of elements. Periodic table has 112 chemical elements. He died in St. Petersburg, Russia, on February 2, 1907 .

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Exercises : №1 What did Isaac Newton invent as a child? №2 Name any Newton law . №3 What university did Newton study?

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№4 Where Dmitri Mendeleyev was born ? A ) Tyumen b) Tobolsk c) St. Petersburg №5 What year Mendeleyev discovered the periodic law ? A ) 1869 b ) 1809 c) 1889 №6 H ow many chemical elements has a periodic system ? 1 12 b) 99 c) 115

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Answers: №1- sundial and clepsydra №2 №3 - Isaac was a student at the University of Cambridge №4-b №5-a №6-a