Question

1. calculate the number of valence electrons in nitrogen trichloride, ncl₃. valence electrons

Explanation:

Step1: Determine valence electrons of nitrogen

Nitrogen (\(N\)) is in group 15 of the periodic table. The number of valence electrons for an element in group \(n\) is \(n - 10\) (for \(n> 10\)). So for \(N\), valence electrons \(=5\).

Step2: Determine valence electrons of chlorine

Chlorine (\(Cl\)) is in group 17. Valence electrons for \(Cl=7\).

Step3: Calculate total valence electrons in \(NCl_{3}\)

In \(NCl_{3}\), there is \(1\) \(N\) atom and \(3\) \(Cl\) atoms.
Total valence electrons \(=1\times5 + 3\times7\)
\(=5 + 21\)
\(=26\)

Answer:

\(26\)