Question

choose the best answer using the periodic table. which type of bond is expected between two cobalt (co) atoms? metallic bond van der waals bond ionic bond covalent bond choose the best answer using the periodic table. what is the name of this compound: pcl₃ monophosphorus trichloride potassium trichloride phosphorus chloride phosphorus trichloride

Explanation:

For question 8:

Cobalt (Co) is a metal. Metals form metallic bonds between their atoms, where valence electrons are delocalized in a shared "sea" of electrons.

For question 9:

$\text{PCl}_3$ is a covalent compound. For naming such compounds, we use prefixes to indicate the number of each atom. Since there is one phosphorus (the first element, so no prefix needed) and three chlorines, the name uses the prefix "tri-" for chlorine, ending in "-ide".

Answer:

1. metallic bond
2. phosphorus trichloride