How many resonance structures does #"NH"_4^(+)# have?

Related questions

• What are the rules for drawing resonance structures?
• When are resonance structures more stable?
• Why is it important to describe the resonance structures in molecules such as ozone, #O_3#, and...
• When drawing resonance structures, it is permissible to alter the way atoms are connected?
• Does the nitrate ion have one long #N¬O# bond and two short #N¬O# bonds?
• Does “resonance” refer to the idea that molecules are resonating rapidly between different...
• Does the cyanide ion only have one dominant resonance structure? Why?
• How can I draw two equivalent resonance structures for the formate ion, #HCO_2^-#?
• What is the significance of the dashed bonds in this ball-and-stick model?
• Why is the #C_6H_8# molecule different from benzene with respect to resonance?