Please Answer all the questions, Experts
1) a. Give reason for the following:
(i) Isotopes of an element are chemically similar.
(ii) Noble gases show least reactivity.
     b. If K and L shells of an atom are full, then what would be the total number of electrons in the atom ? what is the valency of this element ?
     c. write the electronic configuration of an element with atomic number 13 and represent it in terms of Bohr's model of atom.

Dear student

1. ​Isotopes of an element are chemically similar because they have similar atomic number but different mass number. they have same no. of electron and  the elements with similar configuration will have similar properties so they are chemically similar.
2. . The noble gases show least  reactivity because Nobel gas  have a filled valence shell of electrons. So it can not accept electron . And noble gas has no need to lose electrons to gain a stable electron configuration.

please ask question one by one.

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a)They have similar chemical properties because isotopes of an element have the same number of electrons as an atom of that element.
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