Question

nitrogen trifluoride used in the manufacture of microelectronics the image shows part of a microelectronic circuit board and a lewis structure for nitrogen trifluoride. plasma etching is used in the processing of silicon wafers in microelectronics manufacturing. nitrogen trifluoride is one of the most commonly used chemicals for this plasma etching. how many pairs of nonbonding electrons are missing in the provided lewis structure for nitrogen trifluoride? o 3 pairs o 4 pairs o 6 pairs o 10 pairs

Explanation:

Step1: Determine nitrogen's valence electrons

Nitrogen has 5 valence electrons.

Step2: Determine fluorine's valence electrons

Fluorine has 7 valence electrons, and there are 3 fluorine atoms, so 3×7 = 21 valence electrons. Total valence electrons for NF₃ is 5 + 21=26.

Step3: Analyze the Lewis - structure bonding

In the Lewis - structure of NF₃, nitrogen forms 3 single bonds with fluorine. Each bond uses 2 electrons, so 3×2 = 6 electrons are used in bonding.

Step4: Calculate non - bonding electrons

The remaining electrons are non - bonding. 26 - 6=20 non - bonding electrons, which is 10 non - bonding electron pairs. But in the given Lewis - structure, we need to find the missing non - bonding pairs. Nitrogen has 1 lone pair (2 non - bonding electrons) and each fluorine has 3 lone pairs (6 non - bonding electrons per F). In the given structure, if we consider the bonds and the visible non - bonding electrons around atoms, we know that nitrogen has 5 valence electrons. It forms 3 bonds, so 3 of its electrons are used in bonding. The remaining 2 electrons form a lone pair. Each F atom has 7 valence electrons, 1 is used in bonding, so 6 are non - bonding. There are 3 F atoms, so in total there are 3×3 = 9 non - bonding pairs on F atoms and 1 non - bonding pair on N atom, making a total of 10 non - bonding pairs. If we assume some are missing, we note that nitrogen should have 1 non - bonding pair and each fluorine should have 3 non - bonding pairs. If we count the visible non - bonding electrons in the provided (incomplete) structure and calculate based on the valence - electron count, we find that 6 non - bonding pairs are missing.

Answer:

6 pairs