42
Average of 8 deaths a year in American football.
24.
How many football Super Bowls had been held in 1981
2
42
There are four 15 minute periods in arena football. They also play an overtime period if needed.
In high school football they are classified as quarters.
there 3 periods and 20 minutes a period
American football.
Californium hasn't "periods" inside.
3 periods
7 periods.
6 periods
there are four periods in basketball
there are 7 periods in the periodic table118
4