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.
Helium atom has 2 electrons in its valence shell but its valency is not 2, Explain.
Identify the Mg²⁺ ion from the Fig.4.1 where, n and p represent the number of neutrons and protons respectively
The electron distribution in an aluminium atom is
Write down the electron distribution of chlorine atom. How many electrons are there in the L shell? (Atomic number of chlorine is 17).
Fill in the blanks in the following statements (a) Rutherford's α-particle scattering experiment led to the discovery of the ——— (b) Isotopes have same ———but different———. (c) Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will be———and———respectively. (d) The electronic configuration of silicon is ———and that of sulphur is ———.
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