Which are period numbers for 1 to 20 elements?
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0
Answer:
Terms in this set (20)
Hydrogen #1. period 1.
Helium #2. period 1, group 18.
Lithium #3. period 2, group 1.
Beryllium #4. period 2, group 2.
Boron #5. period 2, group 13.
Carbon #6. period 2, group 14.
Nitrogen #7. period 2, group 15.
Oxygen #8. period 2, group 16.
Answered by
3
Answer:
Terms in this set (20)
1. Hydrogen #1. period 1.
2. Helium #2. period 1, group 18.
3. Lithium #3. period 2, group 1.
4. Beryllium #4. period 2, group 2.
5. Boron #5. period 2, group 13.
6. Carbon #6. period 2, group 14.
7. Nitrogen #7. period 2, group 15.
8. Oxygen #8. period 2, group 16.
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