Worksheet 4 / Periodic table

1. Periodic table is the arrangement of elements according to…………………………
2. Periodic table contains 3/4…………… and 1/4………………………………
3. Define semimetals
……………………………………………………………………………
4. Give examples……………………………….
5. Give uses of metalloids …………………………………………
6. Name a non metal in the same period as lithium……………………………

7. Elements in the same group have …………….. Properties
1. Same 2. Similar
8. Group one elements are having similar properties. Why?
………………………………………………………………………………
9. The vertical columns are called ………………, there are ……….no of groups
10. Horizontal columns are called ………………, there are ……….no of periods

10 give the uses of noble gases ……………………………………….
11. Why noble gases are uncreative……………………………………………………………………………………………………………………………………………….
12. Name the group I elements ………………………………………………………..
13. In group I the reactivity increases down the group …………………………………………………………………………………………………………………………………………………
14. Why potassium is more reactive than sodium …………………………………………………………………………………………………………………………………………………
15. Name the gas produced when sodium is kept in water. Give effect of litmus in the remaining solution ……………………………………………………………..
16. Write down three observations that you see when sodium is kept in water
……………………………………………………………………………………………
17. Give the reaction of group I metals (sodium, potassium, lithium) in water. Write the balances equation

…………………………………………………………………………………….

…………………………………………………………………………………….
17. Give the reaction of group 2 metals (magnesium, calcium) in water. Write the balances equation ………………………………………………………………………………………………………………………………………………………………
18. Which one of the following can form a single positive ion?
Sodium, chlorine, neon, calcium
………………………………………………………………………