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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.
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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?
Write the molecular formulae for the following compounds
Helium atom has 2 electrons in its valence shell but its valency is not 2, Explain.
Elements with valency 1 are
An atom with 3 protons and 4 neutrons will have a valency of
