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What is the molecular formula of nitrogen gas?
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The most abundant isotope of an element with Z = 26 has A = 56. Select the correct sequence including number of electrons, number of neutrons and number of unpaired electrons.
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Sort the following compounds from left to right so that the oxygen they contain has increasing oxidation number:
O2; CO; OF2; CaO2; LiO2
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Which orbitals contribute to forming the chemical bond in HBr?
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Select the quantity you can exactly get from 46 g of sodium.
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Select the maximum amount of gaseous oxygen obtainable from one mole of sulfuric acid.
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Balance the following equation and select the correct sequence of the coefficients only for reactants.
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The ratio of the mass of an atom X to one twelfth of the mass of the isotope 12 of carbon is equivalent to ...
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Select the substance with the lowest intramolecular bond energy.
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Which characteristic is associated with the principal quantum number in the hydrogen atom?
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