Electrum doesn't follow BIP39 standards. Go to console and type getmasterprivate.
If the post above didn't work, add () at the end of that command, so type getmasterprivate()
it works. Thanks you two.
i wrote earler but my message go mising.
Sorry my english.. i am from Argentina..
and i still learning btc and.. this forum?.
its a bit confusing to use it