Question

1. how many periods are on the periodic table?
2. how many groups are on the periodic table?
3. what three groups contain elements that are so reactive that they can only be found in the combined state in nature?
4. what groups contain the transition elements?
5. what group contains the halogens?
6. what group contains the alkali metals?
7. what period contains the actinides?
8. what two groups represent the s block of elements?
9. what group are the noble gases?
10. what period contains the lanthanides?
11. what groups make up the p block of elements?
12. what groups make up the d block of elements?
13. what group contains the alkaline earth metals?
14. name the two sets of elements that compose the f block.
15. what group contains elements that are unreactive because their valence shells already have the maximum number of 8 electrons?
16. which element would have a larger atomic radius, potassium or sodium?

Explanation:

1. The periodic table has 7 periods.
2. There are 18 groups on the periodic table.
3. Alkali metals (Group 1), alkaline earth metals (Group 2), and halogens (Group 17) are very reactive and usually found in combined states.
4. Transition elements are in Groups 3 - 12.
5. Halogens are in Group 17.
6. Alkali metals are in Group 1.
7. Actinides are in Period 7.
8. Groups 1 and 2 represent the s - block.
9. Noble gases are in Group 18.
10. Lanthanides are in Period 6.
11. Groups 13 - 18 make up the p - block.
12. Groups 3 - 12 make up the d - block.
13. Alkaline earth metals are in Group 2.
14. Lanthanides and actinides compose the f - block.
15. Noble gases (Group 18) are unreactive as their valence shells have 8 electrons.
16. Potassium has a larger atomic radius than sodium as atomic radius increases down a group.

Answer:

1. 7
2. 18
3. Group 1 (alkali metals), Group 2 (alkaline earth metals), Group 17 (halogens)
4. Groups 3 - 12
5. Group 17
6. Group 1
7. Period 7
8. Groups 1 and 2
9. Group 18
10. Period 6
11. Groups 13 - 18
12. Groups 3 - 12
13. Group 2
14. Lanthanides and actinides
15. Group 18
16. Potassium