What property do all elements in the same column of the Periodic Table as boron have in common?

  • A
    They have the same number of valence electrons.
  • B
    They have the same atomic mass.
  • C
    They have the same number of shells.
  • D
    They have the same metallic character.

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Nitrogen (atomic number $7$) and phosphorus (atomic number $15$) belong to group $15$ of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?

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$(a)$ a total of three shells,with four electrons in its valence shell?
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