Maybe, but for most girls it happens about 12-17 years old. It would take a 7 year old's body to develop faster and produce the needed hormones. Very few girls have this happen to them.
Period #7
That's right, period 7, group 1.
Period 7, group 14
amplitude =7. to find the period, set 2x equal to 2∏. then x=∏=period
Period 7 (it is a member of actinides).
When you are on your period you will bleed 24/7.
The f-block elements in period 7 are known as the actinides.
If you havent had your period in 7 months you probably need to go to the doctor, that is not normal.
It is in the actinides period (separate lower section of Period 7).
As an actinoid mendelevium is considered to be in the period 7.
Period 7, group 14
Plutonium is in the family of actinides, period 7.