Question

a certain covalent compound is named sulfur hexafluoride. whats the chemical formula for this compound?
a) f₆s₂
b) sf₆
c) s₂f₆
d) f₆s
question 15 (5 points)
listen
whats the electron configuration of an n⁻³ ion?
a) he
b) ar
c) ne

Explanation:

Step1: Analyze the naming of sulfur hexafluoride

In naming covalent compounds, the first element is named as is, and the second element has its ending changed to -ide. The prefixes indicate the number of atoms. "Hexa -" means 6. So for sulfur hexafluoride, there is 1 sulfur (S) atom and 6 fluorine (F) atoms. The formula is \(SF_{6}\).

Step2: Analyze the electron configuration of \(N^{-3}\)

Nitrogen (N) has an atomic number of 7, so it has 7 electrons. The \(N^{-3}\) ion has gained 3 electrons, so it has \(7 + 3=10\) electrons. Neon (Ne) has 10 electrons. The electron configuration of \(N^{-3}\) is the same as that of Ne, which can be written as \([Ne]\).

Answer:

For the first question: B. \(SF_{6}\)
For the second question: C. \([Ne]\)