It's important to remember that elements are

No, unless you're doing some sort of course where they demand that you do. It's useful to remember the general features of the periodic table (what each block is, where they are in relation to each other, roughly where the most common elements are), but memorizing the entire thing would simply be a mnemonic exercise

Hope this helped

just did the assignment and the answer was #1 +2 n

catya that's not even a b or c