Samsung has a nasty habit of changing their keyboard on every model they release, and the S7 is no exception. The feature you're looking for seems to be gone from their keyboard and symbols are now relegated to other keys or to the SYM section; the number row is just that now, purely numbers.
I'd recommend switching to another keyboard if you want that. SwiftKey is pretty close to what you have on the S5 (the Samsung keyboard is powered by SwiftKey, after all).
One thing I do like about the keyboard on the S7 that they introduced on this version is that now you can resize the keyboard in any way (leaning towards one side, shorter on one side or the other, centered, different widths, different heights... quite useful!); unfortunately that comes at the expense of no longer having the split keyboard or floating keyboard modes.