Answer:
b.Phosphorus.
d.Nitrogen.
Explanation:
To know the charge of an ion, we need to consider the octet rule: an atom gains, loses or shares electrons to complete their valence shell with 8 electrons.
Which of the following elements would you expect to form an ion with a charge of negative three?
a.Potassium. NO. K has 1 electron in the valence shell so it loses 1 electron to form K⁺.
b.Phosphorus. YES. P has 5 electrons in the valence shell so it gains 3 electrons to form P³⁻.
c.Aluminum. NO. Al has 3 electrons in the valence shell so it loses 3 electrons to form Al³⁺.
d.Nitrogen. YES. N has 5 electrons in the valence shell so it gains 3 electrons to form N³⁻.
