If a person in the united states is legally unable to pay his debts, he may face:

However, some states—roughly a third—still use jail as a method to coerce debtors to pay certain debts. Today, you cannot go to prison for failing to pay for a “civil debt” like a credit card, loan, or hospital bill. You can, however, be forced to go to jail if you don't pay your taxes or child support.

Explanation:

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Electron shells. In the quantum mechanical version of the Bohr atomic model, each of the allowed electron orbits is assigned a quantum number n that runs from  for the orbit closest to the nucleus to infinity for orbits very far from the nucleus. All of the orbitals that have the same value of n make up a shell.

Explanation: