Question

1. write the formula for lithium phosphide. (0.5 points) *

enter your answer

1. what ion would a stable atom of nitrogen form? (0.5 points) *

n²+
n³+
n²-
n³-
n¹+
n¹-

Explanation:

17. Write the formula for lithium phosphide

Step1: Determine the ions

Lithium (\(Li\)) forms \(Li^+\) ion (it loses 1 electron to achieve a stable configuration). Phosphorus (\(P\)) forms \(P^{3 -}\) ion (it gains 3 electrons to achieve a stable octet).

Step2: Use the criss - cross method

For an ionic compound, the formula is determined by balancing the charges. The charge of \(Li^+\) is \(+ 1\) and the charge of \(P^{3-}\) is \(-3\). Using the criss - cross method (the magnitude of the charge of one ion becomes the subscript of the other ion), we get \(Li_3P\).

18. What ion would a stable atom of nitrogen form?

Nitrogen (\(N\)) has 5 valence electrons. To achieve a stable octet (8 valence electrons), it needs to gain 3 electrons. When an atom gains electrons, it forms a negatively - charged ion (anion). The ion formed is \(N^{3-}\).

Answer:

1. \(Li_3P\)
2. \(N^{3 -}\) (corresponding to the option \(N^{3-}\) in the multiple - choice)