Atomic number of which of the following elements is greater than that of Fluorine?
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The atoms of the elements having same difference between mass number and atomic number are called ______.
Which of the following elements has the lowest melting point?
Which of the following is the third member of the Dobereiner triad, that also features Lithium and Sodium?
Acetic Acid is another name for which of the following?
Which of the following is not a Halon gas ?
A standard drink is generally
Phosphorus is kept in water because