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The atomic number of three elements are ...

The atomic number of three elements are given below :
`{:("Element(Symbols)",A, B, C),("Atomic number",5,7,10):}`
Write the symbol of the elements which belongs to (a) group B, (b) groups 15, of the periodic table, state the period of the periodic table to which these elements belong. Give reason for your answer.

Text Solution

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(a) A belongs to group B, because its electronic configuration is 2, 3 i.e, it has 3 valence electrons.
(b) B belongs group 15 because its electronic configuration is 2, 5, i.e, it has 5 valence electrons. They belong to `2^(nd)` period as they both have two shells.
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