Who was the first man to go to space?
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Which of the following elements has the electronic configuration 2, 8, 3?
Which of the following is a chemical formula of quicklime?
Kidney stones are composed of ______.
Which of the following is NOT a nucleon?
The main mineral constituents of the continental mass are ________ and alumina.
How many elements are present in the group of the 18th Modem Periodic Table?
Methane an air pollutant is produced ______.