Three atoms are attached to the central atom in NF3.
In a molecule or ion, the core atom is always thought to have the lowest electronegativity. By contrasting the relative electro negativities of the atoms in the molecule or ion, we may determine which atom should be the central atom.
When we look at NF3, it is clear that nitrogen is the core atom because it has a lower electronegative charge than fluorine. The molecular model also shows that the centre atom had three fluorine atoms linked to it. Consequently, the core atom of the molecule NF3 has three atoms connected to it.
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