Question

which of these is a polyatomic ion?\
\\(\text{co}_4^{+}\\)\
\\(\text{zn}^{4+}\\)\
\\(\text{br}^-\\)\
\\(\text{n}^-\\)\

1. choose the best answer.\

due to low intramolecular forces, most \\(\underline{\quad}\\) compounds exist as gases and liquids at room temperature.\
ionic\
metallic\
covalent\
17 choose the best answer.\
what does penta- mean?\
2\
5\
1

Explanation:

1. A polyatomic ion contains multiple atoms. $\text{CO}_3^{2-}$ has 1 carbon and 3 oxygen atoms, while others are monoatomic ions.
2. Covalent compounds have weak intramolecular forces, leading to gaseous/liquid states at room temp; ionic/metallic have strong forces.
3. "Penta-" is a Greek prefix meaning 5.

Answer:

1. $\text{CO}_3^{2-}$
2. covalent
3. 5