The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 2nd group and the 4th period?
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Which was not produced by volcanic outgassing?
Manganite is an ore/mineral of
Which element is generally No Radioactive?
Benzene is ______ in ethyl alcohol.
Aromatic hydrocarbons contain at least _____ benzene like ring in their molecules.
Which of the following elements has the lowest melting point?
What chemical is injected into a person's body when an ant bites?
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