[填空题]
The formate or methanoate ion,$HCO_2^-$ , is commonly found in living systems, and is part of the synthesis of many amino acids.
1.Determine the number of valence electrons in the methanoate ion; it is valence electrons.
2.Draw a Lewis structure for the methanoate ion. Include resonance structures if resonance is present in the structure.
3.State the molecular geometry is planar;AND the bond angles of the methanoate ion= $^{\circ}$.
4.Justify the existence of a dipole moment in the molecular structure of the methanoate ion.
