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