1Is it easier to remember the names of twenty things around you just as they come, or after you have classified them by a shared property? Give the reason.
2Why do the elements of group 1 fall in that group?
3Why was the need felt to classify the elements?
4State the modern periodic law and explain it in your own words.
5Hydrogen is placed in group 1. Give the reason, and state one way in which it differs from the other elements of group 1.
6Write three differences between metals and non-metals.
7Why do the inert gases not take part in chemical reactions?
8What are a group and a period? How many of each are there in the modern periodic table?
9An element has seven electrons in its outermost shell. Is it a metal or a non-metal? Which group does it fall in, and what is that family called?