Syllabication rules in English exist to help the writer of the language guess how to spell a word she's heard but not seen and to help the reader of the language guess how to pronounce a word she's seen but not heard.
The V/CV pattern gives us two syllables the first of which is known as an open syllable , and it's a convention of English spelling that a single vowel letter at the end of an open syllable is pronounced "long". In contrast, the VC/V pattern gives us two syllables the first of which is a closed syllable, and the convention is that a single vowel letter in a closed syllable is pronounced "short".
Thus the word even is syllabified e/ven: the first syllable is pronounced with "long" e, because the syllable is open - and if it is absolutely necessary to hyphenate the word, the hyphen is written after the first letter e, not after the letter v. The second syllable is a closed syllable and is pronounced with "short" e.
If the word seven to be syllabified se/ven, the first vowel should be pronounced "long" (that is, it should rhyme with even) - but I know of no dialect in English in which that is the case, nor do I know of any writer who would place a hyphen after the first letter e.
It's worth noting that dialects of English differ in their syllabication of the word lever. Most dialects of British English seem to go for le/ver, reflecting (and motivating) a pronunciation with "long" e, but in many dialects of American English the syllabication is lev/er, with a first vowel that is "short".
Education isn't what you know. It's what you can do (and fake, intelligently) with what you know.