If you still have, do this:
1. In Jaxx, go to: Menu -> Tools -> Display Private Keys -> Display Bitcoin Keys.
2. Copy the private-key from each address that is not empty.
3. Go to Electrum: File > New/Restore -> Import Bitcoin address or private keys -> Paste the private-keys from step 2 (one per line) -> Next.
If you did what OmegaStarScream said above (and didn't forget to check 'BIP39 Seed'), then the seed is probably wrong. I just installed Jaxx to try myself and the addresses match in both wallets (Jaxx and Electrum).