how do i write out the isotope of an atom?

0 ⤊

does the little number (kind of like an exponent) go before or after the symbol?????
i think i have seen it both ways, does it matter?

2006-10-14 13:28:33 · 2 answers · asked by um yea hi 4 in Science & Mathematics ➔ Chemistry

The atomic mass number goes on the upper left, the atomic number in the lower right or lower left. Just be consistent.

2006-10-14 14:22:39 · answer #1 · answered by Dr. J. 6 · 0⤊ 0⤋

It goes BEFORE..thanks

2006-10-14 13:31:48 · answer #2 · answered by Anonymous · 0⤊ 0⤋