Which of the following pairs of elements could possibly be in the same group on the periodic table?

A forms a 1+ ion; B forms a 1- ion.

A has an atomic number 15; B forms a 3- ion.

A tends to form a 2+ ion; B tends to gain two electrons.

A tends to gain one electron; B has eight valence electrons.

Question

Which of the following pairs of elements could possibly be in the same group on the periodic table? 

 A forms a 1+ ion; B forms a 1- ion. 

 A has an atomic number 15; B forms a 3- ion. 

 A tends to form a 2+ ion; B tends to gain two electrons. 

 A tends to gain one electron; B has eight valence electrons.

tyteen4a03 · Answer

This is not the chemistry section...

I didn't study Chemistry much but C makes the most sense to me (given that I correctly guessed that 2+ = gain 2 electrons)

anonymous · Answer

thank you , sorry I got confused