One way to determine the nonce of a pending transaction on Etherscan is by looking at the transaction details of the pending transaction (Blog:- How To Solve Ethereum Pending Transactions). The Nonce is the number that determines whether a particular transaction has been confirmed or not. The Nonce can be found on a pending transaction's More details page. The Nonce allows you to perform a new transaction using the same destination address or your own. This will cause the transaction's Nonce to increase artificially.

 A nonce increases in value each time a transaction is confirmed. In other words, a previously submitted transaction will have a nonce of zero, and the next transaction will have a nonce of two. This ensures that no two pending transactions have the same nonce value. This prevents double spending, as transactions are only processed in the order they were submitted. However, if you do not wish to wait for confirmation, you can always resubmit the transaction and use a different nonce number.