Who created the periodic table framework based on recurring chemical properties?
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Dmitri Mendeleev arranged elements in a periodic system.
He also predicted properties of undiscovered elements.
Practice Pakistan questions with answers and explanations.
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Dmitri Mendeleev arranged elements in a periodic system.
He also predicted properties of undiscovered elements.
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War and Peace was written by Leo Tolstoy.
It is set during the Napoleonic era in Russia.
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Alexander Fleming discovered penicillin's antibacterial effect in 1928.
The discovery led to the development of antibiotics.
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Ernest Hemingway wrote The Old Man and the Sea.
The novella follows an aging Cuban fisherman.
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Edward Jenner demonstrated vaccination against smallpox in the 1790s.
His work helped establish immunization.
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George Orwell wrote 1984.
The novel depicts a totalitarian surveillance state.
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Tim Berners-Lee created the World Wide Web at CERN.
He developed core technologies including HTML and HTTP.
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Jupiter is the largest planet by mass and diameter.
It is a gas giant with many moons.
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Mars appears reddish because of iron oxide on its surface.
It is therefore called the Red Planet.
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Saturn has an extensive system of icy rings.
Other giant planets also have rings, but Saturn's are most visible.
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The Moon is Earth's only natural satellite.
It orbits Earth and influences ocean tides.
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Earth rotates on its axis approximately once every 24 hours.
The side facing the Sun experiences day.