Methane contributes towards global warming so it is called a _________________ gas.
The atoms of the elements which have same number of neutrons are called
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Species containing same number of electrons are called
The atoms of the elements having same mass number but different atomic number are called
Which one is not the isotopes of hydrogen
In isotopes the number of neutrons are
Which one of the following elements is essential for construction is nuclear reactors
Which one of the following is not radioactive
A radioactive substance has a half life of four months, three-fourth of the substance would decay in
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