Q33 of 149 Page 211

What are isotopes? Explain by giving an example.

The atoms of the same element having the same atomic number but different mass numbers are known as isotopes. For example: the isotopes of chlorine are 35Cl17 and 37Cl17.


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32

What are valence electrons? Where are valence electrons situated in an atom?

 32

What is the number of valence electrons in the atoms of an element having atomic number 13? Name the valence shell of this atom.

 33

Give one similarity and one difference between a pair of isotopes

 33

Give the number of protons, neutrons and electrons per atom in the two isotopes of chlorine and .