In the modern periodic table, which of the two periods contain 8 elements each?
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In a water molecule, the ratio of mass of Hydrogen to the mass of Oxygen is always:
Which of the following metals is found in free state?
Except Helium, all noble gases have how many electrons in the outermost shell?
Name the Russian chemist who stated that the properties of elements are a periodic function of their atomic masses?
Which of the following is NOT a radioactive element?
Two or more elements combine to form a
The smell that we get when LPG cylinder leaks is due to the presence of
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