Question

question 1 (1 point)
listen
the correct formulas for beryllium sulfide and lithium phosphide are:

1. bes and li₃p
2. bas₂ and li₃(po₄)
3. beso₄ and li(po₄)₃
4. be₂s and lip₃

Explanation:

• Beryllium (\(Be\)) has a charge of \(+2\) and sulfide (\(S^{2-}\)) has a charge of \(-2\). Using the criss - cross method (the magnitude of the charge of one ion becomes the subscript of the other ion), for \(Be^{2 +}\) and \(S^{2-}\), the formula is \(BeS\) (since \(\frac{2}{2}=1\) for both sub - scripts).
• Lithium (\(Li\)) has a charge of \(+1\) and phosphide (\(P^{3-}\)) has a charge of \(-3\). Using the criss - cross method, the formula is \(Li_3P\) (because the charge of \(P^{3-}\) (\(3\)) becomes the sub - script of \(Li\) and the charge of \(Li^{+}\) (\(1\)) becomes the sub - script of \(P\)).

Answer:

1. \(BeS\) and \(Li_3P\)