By law (education law that is) you get given a periodic table with assesments and exams but it's so much easier and quicker if you just learn the ones that are used the most like iron and magnesium etc.
It's like maths and timetable's. you can just do it in your head but if you know it then it's alot quicker...well thats my opinion anyway lol
It's like maths and timetable's. you can just do it in your head but if you know it then it's alot quicker...well thats my opinion anyway lol