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What information do you get from the following figures about the valency, atomic number and mass number of atoms X, Y and Z? Give your answer in a tabular form.
One electron is present in the outer most shell of the atom of an element X. What would be the nature and value of the charge on the ion formed if this electron is removed from the outer most shell?
Give the chemical formulae for the following compounds and compute the ratio by mass of the combining elements in each one of them.
Write the molecular formulae for the following compounds
Helium atom has 2 electrons in its valence shell but its valency is not 2, Explain.
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