private static void WriteAtom(
TextWriter writer, Molecule molecule, int i)
{
string empty3DCoords = " 0.0000 0.0000 0.0000 ";
string emptyTail = " 0 0 0 0 0 0 0 0 0 0 0 0";
string symbol = molecule.GetSymbolFor(i);
writer.Write(empty3DCoords + $"{symbol,-3:D}" + emptyTail);
writer.Write('\n');
}
