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lead
cadmium
zinc
radium
In addition to hydrogen, the other abundant element present on Suns surface is
In an atom the order of filling up of the orbitals is governed by
In an oxygen molecule, two atoms are united by
In cold countries alcohol is preferred to mercury as a thermometric liquid because
In drinking water supply, which of the following treatments is not involved
In ethane, each carbon atom is bonded to
In galvanization, iron is coated with
In known elements, the maximum number is of
In organic compounds, nitrogen is estimated by
In polluted water, the dissolved oxygen in it