12. What do you understand by valency of an element? What is valency of boron?
13. List the features of Rutherford's nuclear model of atom.
14. What are the postulates of Bohr Model of an atom?
15. Define Valency. What is the valency of chlorine, sulphur and magnesium?
16. Ci has completely filled K&L shells. Explain.
17. Nat is possible but Cl* is not possible. What is the reason?
18. What are isotopes? Give two examples.
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Answer:
12)Valency is number of electrons in outermost shell
the valency of boron is 3
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