Final answer:
An atom with 5 protons and 6 electrons has a negative electric charge because the number of negatively charged electrons is greater than the number of positively charged protons.
Step-by-step explanation:
The electric charge of an atom can be determined by comparing the number of protons, which are positively charged, and electrons, which are negatively charged. Neutrons, on the other hand, do not carry a charge and thus do not contribute to an atom's net electric charge. In this case, you have mentioned an atom with 5 protons and 6 electrons.
Since an atom is electrically neutral when it has an equal number of protons and electrons, this particular atom with an extra electron will have a net negative charge. Therefore, the electric charge of this atom would be negative.