What are the formal charges on the sulfur (SS), carbon (CC), and nitrogen (NN) atoms, respectively, in the resonance structure that contributes most to the stability of the thiocyanate ion, SCN−SCN−?

The formal charges of sulfur (S), carbon (C) and nitrogen (N) atoms in SCN⁻ are (-1), 0 and 0, respectively.

Explanation:

At first, let us consider the formula to calculate formal charge as follows:

Formal Charge = Valence electrons - Unbonded electrons - Bonded electrons

According to the structure of [S-C≡N]⁻,

The formal charges of S, C and N are as follows:

S = 6 - 6 - = -1

C = 4 - 0 - = 0

N = 5 - 2 - = 0

So, the formal charges of sulfur (S), carbon (C) and nitrogen (N) atoms in SCN⁻ are (-1), 0 and 0, respectively.

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metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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